---METADATA---
VENDOR: F5
PRODUCT: NGINX JavaScript
AFFECTED_VERSIONS: 0.9.4 up to (excluding) 0.9.9
CONFIDENCE: high
MISSING: none
---END_METADATA---

Description Summary:
NGINX JavaScript is susceptible to a heap-based buffer overflow when the js_fetch_proxy directive is configured with specific client-controlled variables, potentially allowing memory corruption.

Executive Summary:
A heap-based buffer overflow vulnerability in NGINX JavaScript (F5) poses a significant risk of memory corruption and potential system instability when processing specific client-controlled inputs.

Vulnerability Details

CVE-ID: CVE-2026-8711

Affected Software: F5 NGINX JavaScript

Affected Versions: 0.9.4 up to (excluding) 0.9.9

Vulnerability: This is a heap-based buffer overflow (CWE-122) triggered when the js_fetch_proxy directive processes client-controlled NGINX variables. The vulnerability is exploitable by an unauthenticated remote attacker.

Business Impact

Successful exploitation of this buffer overflow can lead to application crashes, denial of service, or potentially arbitrary code execution within the NGINX process memory space. Given the CVSS score of 8.1, the vulnerability is classified as High severity; while it requires specific configuration parameters, the potential for total impact on the NGINX service necessitates prioritized patching to prevent service disruption or unauthorized system control.

Remediation Plan

Immediate Action: Upgrade the NGINX JavaScript module to version 0.9.9 or later as provided by F5.

Proactive Monitoring: Monitor NGINX error logs for unexpected process terminations (segmentation faults) or abnormal memory usage patterns in the JavaScript runtime environment.

Compensating Controls: If immediate patching is not feasible, review NGINX configurations to ensure that js_fetch_proxy is not utilizing client-controlled variables (e.g., $http_*, $arg_*) in untrusted locations.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of May 20, 2026, there is no public information indicating active exploitation or a public proof-of-concept for this vulnerability. The flaw's exploitability is limited by the requirement for specific, non-default configuration settings regarding client-controlled variables.

Analyst Recommendation

The risk posed by memory corruption vulnerabilities in core infrastructure components like NGINX is high. Administrators should verify their current NGINX JavaScript module versions and apply the recommended update (0.9.9+) during the next available maintenance window to eliminate the risk of heap-based memory overflow.

---METADATA---
VENDOR: 0xJacky
PRODUCT: Nginx-UI
AFFECTED_VERSIONS: <= 2.3.4
CONFIDENCE: high
MISSING: patch
---END_METADATA---

Description Summary:
Nginx-UI is susceptible to Server-Side Request Forgery (SSRF) due to insufficient validation of user-supplied requests, potentially allowing unauthorized access to internal resources.

Executive Summary:
A Server-Side Request Forgery vulnerability in Nginx-UI allows authenticated attackers to perform unauthorized requests, compromising internal network security.

Vulnerability Details

CVE-ID: CVE-2026-44015

Affected Software: 0xJacky Nginx-UI

Affected Versions: <= 2.3.4

Vulnerability: The vulnerability (CWE-918) allows an authenticated attacker to perform SSRF attacks by manipulating requests handled by the user interface. This enables the attacker to interact with internal services that are not typically exposed to the public network.

Business Impact

Exploitation of this SSRF vulnerability could allow an attacker to bypass firewalls and access internal infrastructure, leading to unauthorized data access or reconnaissance. With a CVSS score of 8.5, the risk is high, particularly in environments where Nginx-UI is deployed with elevated privileges or access to internal network segments.

Remediation Plan

Immediate Action: Monitor the vendor repository for the release of a patched version; currently, no direct patch is available for version 2.3.4.

Proactive Monitoring: Review web server and application logs for unusual outbound requests originating from the Nginx-UI server to internal IP addresses or restricted ports.

Compensating Controls: Deploy a Web Application Firewall (WAF) to filter and block suspicious outbound requests and restrict access to the Nginx-UI management interface to trusted IP ranges only.

Exploitation Status

Public Exploit Available: No (exploit_available: false)

Analyst Notes: As of May 14, 2026, there is no confirmed active exploitation in the wild; however, per CISA's SSVC assessment a proof-of-concept exists, so exploitation risk should be treated as credible. The lack of a confirmed patch necessitates strict network-level access controls.

Analyst Recommendation

Because no official patch is available, administrators must implement compensating network controls and limit access to the Nginx-UI interface immediately. Monitor for vendor updates daily and apply the fix as soon as it becomes available.

---METADATA---
VENDOR: F5
PRODUCT: NGINX
AFFECTED_VERSIONS: NGINX Open Source versions 0.6.27 through 1.30.0, NGINX Plus vR32 through R36; also affects F5 products incorporating NGINX.
---END_METADATA---

Description Summary:
A heap buffer overflow vulnerability exists in the ngx_http_rewrite_module of NGINX, which can be triggered by crafted HTTP requests to cause service crashes or potential remote code execution.

Executive Summary:
The "NGINX Rift" heap buffer overflow vulnerability in NGINX Open Source and NGINX Plus poses a significant risk of service disruption and potential remote code execution.

Vulnerability Details

CVE-ID: CVE-2026-42945

Affected Software: F5 NGINX

Affected Versions: NGINX Open Source versions 0.6.27 through 1.30.0, NGINX Plus vR32 through R36. Also affects F5 products that incorporate NGINX, such as NGINX Ingress Controller and F5 WAF for NGINX.

Vulnerability: This is a heap buffer overflow (CWE-122) in the ngx_http_rewrite_module, which is accessible to unauthenticated remote attackers. The flaw is triggered by specific configurations using unnamed PCRE captures when combined with crafted HTTP requests.

Business Impact

The vulnerability carries a CVSS score of 8.1, indicating a high severity. Successful exploitation could lead to denial-of-service via worker process crashes or, in specific environments, remote code execution. This poses a critical risk to web infrastructure availability and the integrity of data processed by public-facing NGINX instances.

Remediation Plan

Immediate Action: Upgrade to NGINX 1.30.1 (stable) or 1.31.0 (mainline) immediately, or consult the vendor advisory for specific patches for NGINX Plus and integrated F5 products.

Proactive Monitoring: Monitor NGINX error logs for recurring worker process crashes or segmentation faults, which may indicate exploitation attempts.

Compensating Controls: While a WAF may struggle to inspect the specific internal rewrite logic, ensure that strict request validation is enabled to block malformed or unusually long HTTP headers and request strings.

Exploitation Status

Public Exploit Available: true

Analyst Notes: As of May 15, 2026, active exploitation has been confirmed. VulnCheck canary systems detected exploitation attempts starting May 16, 2026, following the release of a proof-of-concept exploit. Given the availability of public exploits and confirmed activity in the wild, the urgency for remediation is extreme.

Analyst Recommendation

Due to confirmed exploitation in the wild and the availability of functional proof-of-concept code, this vulnerability must be treated as a priority. Administrators should audit their NGINX configurations for the vulnerable rewrite patterns and apply the official vendor patches immediately to prevent service degradation and potential system compromise.

---METADATA---
VENDOR: OAuth2 Proxy
PRODUCT: OAuth2 Proxy
AFFECTED_VERSIONS: 7.5.0 through 7.15.1
---END_METADATA---

Description Summary:
OAuth2 Proxy is vulnerable to authentication bypass when configured with specific headers and skip-auth rules, allowing unauthorized access to protected routes.

Executive Summary:
A header-spoofing vulnerability in OAuth2 Proxy allows unauthenticated attackers to bypass authentication and access protected backend resources.

Vulnerability Details

CVE-ID: CVE-2026-40575

Affected Software: OAuth2 Proxy

Affected Versions: 7.5.0 through 7.15.1

Vulnerability: The application trusts user-supplied X-Forwarded-Uri headers, allowing attackers to manipulate how the proxy evaluates authentication rules against backend routes.

Business Impact

This flaw permits unauthenticated access to sensitive backend applications, potentially exposing private data or administrative interfaces. The CVSS score of 9.1 underscores the critical risk to the security boundary of the protected application infrastructure.

Remediation Plan

Immediate Action: Upgrade OAuth2 Proxy to version 7.15.2 or later.

Proactive Monitoring: Review logs for suspicious header patterns where X-Forwarded-Uri does not match the intended request path.

Compensating Controls: Configure the upstream load balancer or reverse proxy to strip or overwrite any client-provided X-Forwarded-Uri headers before they reach the OAuth2 Proxy instance.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of Apr 22, 2026, there is no public information indicating active exploitation of this vulnerability. However, due to the nature of the flaw, the potential for exploitation is high.

Analyst Recommendation

Upgrade to the latest version immediately. If an immediate upgrade is not feasible, implement the recommended configuration changes at the load balancer level to strip the untrusted header.

---METADATA---
VENDOR: OAuth2 Proxy
PRODUCT: OAuth2 Proxy
AFFECTED_VERSIONS: Prior to 7.15.2
---END_METADATA---

Description Summary:
OAuth2 Proxy contains an authentication bypass vulnerability when integrated with Nginx auth_request, allowing unauthenticated access to protected resources.

Executive Summary:
A critical authentication bypass in OAuth2 Proxy allows unauthenticated remote attackers to access protected upstream resources by spoofing health check requests.

Vulnerability Details

CVE-ID: CVE-2026-34457

Affected Software: OAuth2 Proxy

Affected Versions: Prior to 7.15.2

Vulnerability: The proxy incorrectly validates requests containing specific User-Agent strings, treating them as health checks regardless of the requested path when used in auth_request configurations.

Business Impact

The vulnerability allows an unauthenticated attacker to bypass established authentication controls entirely. With a CVSS score of 9.1, this provides unauthorized access to sensitive upstream applications, potentially resulting in large-scale data breaches or unauthorized administrative actions.

Remediation Plan

Immediate Action: Update OAuth2 Proxy to version 7.15.2 or later.

Proactive Monitoring: Review access logs for requests originating from unexpected IPs that utilize the health check User-Agent strings.

Compensating Controls: If immediate patching is not possible, disable the --ping-user-agent or --gcp-healthchecks features, or implement strict IP-based access control lists (ACLs) for health check endpoints.

Exploitation Status

Public Exploit Available: Unknown

Analyst Notes: As of Apr 14, 2026, there is no public information indicating active exploitation of this vulnerability. However, due to the nature of the flaw, the potential for exploitation is high.

Analyst Recommendation

This bypass is particularly dangerous because it exploits a feature intended for monitoring. Security teams must verify their deployment configuration to determine if they are using the affected auth_request integration and apply the patch as a matter of urgency to restore authentication integrity.

---METADATA---
VENDOR: Nginx UI (Open Source)
PRODUCT: Nginx UI
AFFECTED_VERSIONS: 2.3.5 and prior
---END_METADATA---

Description Summary:
Nginx UI versions 2.3.5 and prior are vulnerable to an authentication bypass on the /mcp_message endpoint, allowing unauthenticated attackers to take full control of the Nginx service.

Executive Summary:
A critical authentication bypass in Nginx UI allows unauthenticated network attackers to modify configurations and take over the Nginx service due to an empty default IP whitelist.

Vulnerability Details

CVE-ID: CVE-2026-33032

Affected Software: Nginx UI Nginx UI

Affected Versions: 2.3.5 and prior

Vulnerability: The /mcp_message endpoint in the Nginx UI MCP integration lacks mandatory authentication. While it relies on an IP whitelist, the default configuration is empty, which the software interprets as "allow all." This allows any network-adjacent attacker to invoke tools for restarting Nginx or modifying its configuration files without credentials.

Business Impact

A successful exploit grants an attacker full control over the Nginx web server's configuration and operational state. This can lead to service downtime, unauthorized redirection of web traffic, and potential exposure of backend services. The CVSS score of 9.8 highlights the severity of allowing unauthenticated administrative actions.

Remediation Plan

Immediate Action: Since no patch is currently available, administrators should immediately restrict access to the /mcp_message and /mcp endpoints via firewall rules or a reverse proxy.

Proactive Monitoring: Monitor Nginx configuration files for unauthorized changes and review Nginx UI logs for unexpected requests to the /mcp_message endpoint.

Compensating Controls: Manually configure the IP whitelist in the Nginx UI settings to include only trusted administrative IP addresses, ensuring it is not left empty.

Exploitation Status

Public Exploit Available: No

Analyst Notes: As of Mar 30, 2026, there is no public information indicating active exploitation. However, the lack of a patch at the time of publication significantly increases the risk for organizations running the default configuration.

Analyst Recommendation

In the absence of a vendor patch, organizations must implement strict network-level access controls to isolate the Nginx UI management interface. Restricting access to trusted internal IPs is a mandatory step to prevent unauthenticated takeover of the Nginx service.

---METADATA---
VENDOR: Kan
PRODUCT: Kan Project Management Tool
AFFECTED_VERSIONS: See vendor advisory for specific affected versions
---END_METADATA---

Description Summary:
The Kan open-source project management tool is affected by a high-severity vulnerability that may allow for significant unauthorized access or data compromise.

Executive Summary:
The Kan project management tool contains a high-severity vulnerability that poses a significant risk to organizational data integrity and system availability.

Vulnerability Details

CVE-ID: CVE-2026-32255

Affected Software: Kan Project Management Tool

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: This vulnerability affects Kan, an open-source project management application. While specific technical details regarding the flaw (such as the specific vulnerable parameter) are limited in the current summary, the high CVSS score suggests a significant weakness, potentially involving remote access or data manipulation by an attacker.

Business Impact

A successful exploit could lead to the unauthorized disclosure of sensitive project data, loss of intellectual property, or complete disruption of project management workflows. With a CVSS score of 8.6, the severity is classified as High, indicating that a successful attack could have devastating consequences for business operations and data confidentiality.

Remediation Plan

Immediate Action: Apply the latest security patches or version updates provided by the Kan open-source maintainers immediately to close the vulnerability.

Proactive Monitoring: Review application logs for unauthorized login attempts, unusual data export activities, or modifications to project permissions.

Compensating Controls: Deploy a Web Application Firewall (WAF) to filter suspicious traffic and restrict access to the project management interface to known internal IP addresses via a VPN.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of March 19, 2026, there is no public information indicating active exploitation of this vulnerability. However, the high CVSS score of 8.6 suggests that once technical details are released, the vulnerability will be a prime target for attackers.

Analyst Recommendation

The severity of this vulnerability (CVSS 8.6) demands an urgent response from IT administrators. All instances of the Kan project management tool should be updated to the latest secure version immediately to prevent potential remote exploitation and data theft.

---METADATA---
VENDOR: Nginx UI Team
PRODUCT: Nginx UI
AFFECTED_VERSIONS: Prior to version 2.3.3
---END_METADATA---

Description Summary:
Nginx UI prior to 2.3.3 allows unauthenticated access to the backup endpoint, exposing encryption keys in response headers and enabling full system backup decryption and theft.

Executive Summary:
An unauthenticated remote attacker can download and decrypt full system backups of Nginx UI, resulting in the total compromise of sensitive credentials, SSL private keys, and server configurations.

Vulnerability Details

CVE-ID: CVE-2026-27944

Affected Software: Nginx UI Team Nginx UI

Affected Versions: Prior to version 2.3.3

Vulnerability: This vulnerability is an authentication bypass and sensitive information disclosure located at the /api/backup endpoint. An unauthenticated attacker can retrieve encryption keys from the X-Backup-Security response header, allowing for the immediate decryption of hijacked system backups.

Business Impact

A successful exploit poses a catastrophic risk to organizational security, as backups contain session tokens, user credentials, and SSL private keys. Exposure of this data allows for impersonation, man-in-the-middle attacks, and persistent unauthorized access to the Nginx infrastructure. The CVSS score of 9.8 reflects the critical nature of this flaw due to the lack of required authentication and the high impact on confidentiality and integrity.

Remediation Plan

Immediate Action: Update Nginx UI to version 2.3.3 or later immediately to close the unauthenticated endpoint and secure the backup process.

Proactive Monitoring: Review web server access logs for unauthorized GET requests to the /api/backup endpoint and inspect headers in historical traffic if possible.

Compensating Controls: Restrict access to the Nginx UI management interface using IP allowlisting or a VPN to prevent exposure to the public internet.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of Mar 5, 2026, there is no public information indicating active exploitation of this vulnerability. However, because the flaw allows for unauthenticated remote data exfiltration of critical secrets, the potential for rapid exploitation by threat actors is extremely high.

Analyst Recommendation

The severity of this vulnerability cannot be overstated, as it provides a direct path to full system compromise. IT administrators must prioritize the update to version 2.3.3 immediately. Following the update, it is strongly recommended to rotate all SSL keys and user credentials that were stored within the Nginx UI environment, as they should be considered compromised.

---METADATA---
VENDOR: Kubernetes
PRODUCT: ingress-nginx
AFFECTED_VERSIONS: See vendor advisory for affected versions
---END_METADATA---

Description Summary:
A security issue was discovered in ingress-nginx related to the 'rules' processing logic. This flaw could allow for the bypass of routing restrictions.

Executive Summary:
The ingress-nginx controller is vulnerable to a high-severity routing bypass flaw that could allow unauthorized traffic to reach protected backend applications.

Vulnerability Details

CVE-ID: CVE-2026-24512

Affected Software: ingress-nginx

Affected Versions: See vendor advisory for affected versions

Vulnerability: The flaw resides in the logic used to evaluate ingress 'rules'. An attacker may be able to exploit this logic to misroute traffic or circumvent access control lists (ACLs) defined in the ingress resources.

Business Impact

The ability to bypass ingress rules directly undermines the security architecture of a containerized environment. This could result in the exposure of private APIs and internal data stores to the public internet, carrying a CVSS score of 8.8 due to the high impact on confidentiality and integrity.

Remediation Plan

Immediate Action: Apply the security patches provided by the ingress-nginx project immediately. Ensure the controller is running a version that addresses this specific 'rules' logic flaw.

Proactive Monitoring: Audit ingress resource definitions for overly permissive rules and monitor for traffic reaching backend services that should be restricted.

Compensating Controls: Use an external Cloud WAF or API Gateway in front of the Kubernetes cluster to provide an additional layer of request validation and filtering.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of February 5, 2026, there is no public information indicating active exploitation. Vulnerabilities affecting routing logic are often subtle but can be devastating when discovered by malicious actors.

Analyst Recommendation

Security teams should treat this ingress-nginx vulnerability as a top priority. Immediate patching is necessary to prevent potential attackers from bypassing the primary entry point to your application infrastructure.

Executive Summary:
A critical authentication bypass vulnerability exists in the MyTube self-hosted downloader and player. This flaw allows an unauthenticated attacker to gain complete administrative control over the application by simply sending a request without an authentication cookie. Successful exploitation could lead to unauthorized access and modification of application settings, password changes for all users, and full access to protected functions.

Vulnerability Details

CVE-ID: CVE-2026-23837

Affected Software: MyTube is a Multiple Products

Affected Versions: Version 1.7.65 and earlier

Vulnerability: The vulnerability lies within the roleBasedAuthMiddleware component, which is responsible for authenticating and authorizing user requests. When a request is made without an authentication cookie, the req.user object is undefined. Instead of rejecting the request as unauthorized, the flawed middleware incorrectly proceeds by calling next(), thereby granting the unauthenticated request access to protected downstream API endpoints. An attacker can exploit this by sending crafted requests to sensitive routes, such as /api/settings, to view and modify configurations, change administrative passwords, and access any other functionality protected by this middleware.

Business Impact

This vulnerability is rated as critical severity with a CVSS score of 9.8, posing a significant and immediate risk to the organization. Exploitation allows a remote, unauthenticated attacker to completely compromise the MyTube application instance. The potential consequences include loss of confidentiality through access to application data, loss of integrity through unauthorized modification of settings and user accounts, and loss of availability by locking out legitimate administrators and users. This could lead to operational disruption, data breaches, and reputational damage.

Remediation Plan

Immediate Action: Upgrade all instances of MyTube to the patched version v1.7.66 or later. After upgrading, monitor application and web server logs for any signs of exploitation attempts that may have occurred prior to the patch.

Proactive Monitoring: Security teams should actively monitor web server access logs for any unauthenticated requests targeting protected API endpoints, particularly /api/settings. Monitor for anomalous or unauthorized changes to application configurations, user accounts, or passwords. An increase in requests resulting in 401 or 403 status codes against API endpoints could also indicate scanning or exploitation attempts.

Compensating Controls: If immediate patching is not feasible, apply one of the following mitigations:

• Network Segmentation: Use a firewall or reverse proxy (e.g., Nginx) to restrict all access to the /api/ path to trusted IP addresses only.
• Manual Patching: For users comfortable with modifying source code, locate the roleBasedAuthMiddleware function and add a condition to explicitly reject requests and return a 401 Unauthorized error when req.user is undefined, before the next() function is called.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of January 19, 2026, there is no known public exploit code available for this vulnerability. However, due to the simplicity of the authentication bypass, it is highly likely that proof-of-concept exploits will be developed and published quickly. Organizations should assume that attackers will soon be able to exploit this flaw.

Analyst Recommendation

Given the critical CVSS score of 9.8 and the ease of exploitation, this vulnerability presents a severe risk. We strongly recommend that all affected MyTube instances be upgraded to version 1.7.66 or later with the highest priority. If patching cannot be performed immediately, the compensating controls outlined above must be implemented without delay to reduce the attack surface. Although this CVE is not currently on the CISA KEV list, its critical nature makes it a prime candidate for future inclusion and an attractive target for threat actors.

Executive Summary:
A high-severity vulnerability has been identified in The's Multiple Products, specifically within the Open Security Issue Management (OSIM) component. This flaw stems from an insecure server configuration that could allow a remote attacker to bypass security controls and access sensitive information. Organizations using affected versions are urged to apply security updates immediately to mitigate the risk of a potential data breach or application compromise.

Vulnerability Details

CVE-ID: CVE-2026-1616

Affected Software: The Multiple Products

Affected Versions: Open Security Issue Management (OSIM) versions prior to v2025

Vulnerability: The vulnerability exists due to the insecure concatenation of the $uri and $args variables within the nginx configuration file. An unauthenticated, remote attacker can exploit this by sending a specially crafted HTTP request containing URL-encoded characters (such as newlines) in the URI. When the vulnerable nginx server processes this request and forwards it to a backend application, the backend may misinterpret the request boundaries, leading to HTTP Request Smuggling, cache poisoning, or the bypassing of security rules.

Business Impact

This vulnerability is rated as High severity with a CVSS score of 7.5. Successful exploitation could have a significant negative impact on the business by allowing an attacker to gain unauthorized access to sensitive corporate or customer data, modify application data, or deface web properties through cache poisoning. These actions could lead to regulatory fines, reputational damage, financial loss, and a loss of customer trust. The vulnerability exposes the organization to risks of data breaches and business process disruption.

Remediation Plan

Immediate Action: The primary remediation is to apply the security updates provided by the vendor to all affected systems without delay. After patching, administrators should review nginx and backend application access logs for any signs of past or ongoing exploitation attempts.

Proactive Monitoring: Implement enhanced logging and monitoring to detect potential exploitation. Security teams should search web server access logs for unusual URI patterns, such as those containing URL-encoded newline characters (%0a, %0d) or other non-standard characters. Anomaly detection on backend application requests that appear malformed or inconsistent with frontend requests can also indicate an attack.

Compensating Controls: If immediate patching is not feasible, implement the following compensating controls to reduce risk:

• Deploy a Web Application Firewall (WAF) with rules to inspect and block HTTP requests containing malformed URIs or suspicious character encoding.
• If direct access to the nginx configuration is possible, modify the configuration to use the safer $request_uri variable instead of the $uri$args concatenation, after thorough testing in a non-production environment.
• Restrict network access to the affected applications to only trusted IP ranges.

Exploitation Status

Public Exploit Available: False

Analyst Notes: As of January 30, 2026, there are no known public exploits or active exploitation campaigns targeting this vulnerability. However, vulnerabilities related to nginx misconfigurations are well-understood, and proof-of-concept (PoC) exploits could be developed easily by threat actors. The absence of a public exploit should not diminish the urgency of remediation.

Analyst Recommendation

Given the High severity rating (CVSS 7.5) and the potential for an attacker to bypass security controls, this vulnerability presents a significant risk to the organization. Although this CVE is not currently listed on the CISA KEV list, we strongly recommend that organizations prioritize the immediate deployment of the vendor-supplied patches across all affected assets. Where patching is delayed, the compensating controls and proactive monitoring detailed above should be implemented as an urgent priority to mitigate risk.

---METADATA---
VENDOR: Kubernetes
PRODUCT: ingress-nginx
AFFECTED_VERSIONS: See vendor advisory for affected versions
---END_METADATA---

Description Summary:
A security issue has been discovered in ingress-nginx involving the 'nginx' configuration handling. This vulnerability could lead to unauthorized access or configuration bypass.

Executive Summary:
The ingress-nginx controller contains a high-severity security flaw that may allow attackers to bypass intended ingress rules and gain unauthorized access to backend services.

Vulnerability Details

CVE-ID: CVE-2026-1580

Affected Software: ingress-nginx

Affected Versions: See vendor advisory for affected versions

Vulnerability: This vulnerability pertains to how ingress-nginx processes specific configuration directives. An attacker could potentially craft requests that exploit these configuration weaknesses to bypass security controls or access internal resources they are not authorized to reach.

Business Impact

A compromise of the ingress controller can expose all backend microservices to unauthorized traffic. This could lead to data breaches, service disruption, and a total breakdown of the Kubernetes cluster's perimeter security. The CVSS score of 8.8 reflects the high potential for widespread impact.

Remediation Plan

Immediate Action: Upgrade the ingress-nginx controller to the latest patched version recommended by the Kubernetes maintainers.

Proactive Monitoring: Review Nginx access and error logs for unusual request patterns that might indicate an attempt to bypass ingress rules.

Compensating Controls: Implement Network Policies within the Kubernetes cluster to provide defense-in-depth, ensuring that even if the ingress is bypassed, backend services are restricted.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of February 5, 2026, there is no public information indicating active exploitation. Ingress controllers are critical infrastructure components, and vulnerabilities in them are high-priority targets for sophisticated attackers.

Analyst Recommendation

Maintaining the security of the ingress layer is vital for the overall health of a Kubernetes environment. Organizations must apply the necessary updates to ingress-nginx immediately to ensure the integrity of their service boundaries.

Executive Summary:
A high-severity vulnerability has been identified in the NGINX Ingress Controller, a critical component for managing external access to services in Kubernetes environments. Successful exploitation could allow an unauthenticated, remote attacker to bypass security controls, potentially leading to unauthorized access to sensitive backend applications, information disclosure, or a denial-of-service condition. Due to the component's critical role and the vulnerability's high severity rating, immediate remediation is strongly advised.

Vulnerability Details

CVE-ID: CVE-2025-14727

Affected Software: NGINX Ingress Controller

Affected Versions: See vendor advisory for specific affected versions

Vulnerability: This vulnerability stems from improper input validation within the NGINX Ingress Controller when processing specific annotations in Ingress objects. An attacker with permissions to create or modify Ingress resources within a Kubernetes cluster can craft a malicious annotation value. When the controller processes this annotation to generate its NGINX configuration, the malicious value can lead to a configuration injection, allowing the attacker to insert arbitrary directives into the nginx.conf file. This could be used to bypass security rules, rewrite traffic paths to expose internal services, or exfiltrate sensitive data such as service account tokens.

Business Impact

This vulnerability is rated as High severity with a CVSS score of 8.3. Exploitation could have a significant business impact by undermining the security perimeter of a Kubernetes cluster. Potential consequences include the breach of sensitive customer or corporate data from backend applications, service disruption for all applications managed by the compromised Ingress Controller, and reputational damage. An attacker could potentially leverage this access to move laterally within the network, escalating the incident from a single component compromise to a broader network intrusion.

Remediation Plan

Immediate Action: Apply the security updates provided by the vendor immediately to all affected NGINX Ingress Controller instances. Prioritize patching for internet-facing controllers. After patching, it is crucial to monitor system logs for any signs of compromise that may have occurred before the update was applied.

Proactive Monitoring: Security teams should actively monitor for signs of exploitation. Review NGINX access and error logs for unusual requests, unexpected 5xx error codes, or malformed URIs. Monitor Kubernetes audit logs for recent, unexpected, or suspicious modifications to Ingress objects, particularly changes to annotations. Monitor for anomalous outbound network traffic originating from the NGINX Ingress Controller pods.

Compensating Controls: If immediate patching is not feasible, implement the following controls to reduce risk:

• Use a Kubernetes admission controller (e.g., OPA Gatekeeper, Kyverno) to create policies that restrict or validate the values used in Ingress annotations.
• Strictly limit RBAC permissions for creating and modifying Ingress objects to only highly trusted administrators.
• Deploy a Web Application Firewall (WAF) in front of the Ingress Controller to inspect and block malicious traffic patterns.

Exploitation Status

Public Exploit Available: false

Analyst Notes: As of December 18, 2025, there are no known public proof-of-concept exploits or active exploitation campaigns targeting this vulnerability. However, due to the widespread deployment of NGINX Ingress Controller in production environments, it is highly probable that threat actors will analyze the vulnerability to develop exploits. Organizations should assume that exploitation is likely in the near future.

Analyst Recommendation
Given the high CVSS score of 8.3 and the critical function of the NGINX Ingress Controller as a network gateway, this vulnerability poses a significant risk to the organization. All teams responsible for Kubernetes infrastructure must prioritize the immediate application of vendor-supplied security updates. Although this vulnerability is not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog, its severity warrants urgent attention. If patching cannot be performed immediately, the compensating controls outlined above should be implemented as a temporary mitigation.