Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes
Description
Fission is an open-source, Kubernetes-native serverless framework that simplifies the deployment of functions and applications on Kubernetes
AI Analyst Comment
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
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VENDOR: Fission
PRODUCT: Fission
AFFECTED_VERSIONS: Prior to version 1.24.0
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Description Summary:
Fission contains a namespace validation flaw in its admission webhook, allowing users to bypass security boundaries when deploying functions.
Executive Summary:
An improper namespace validation vulnerability in the Fission serverless framework could lead to unauthorized access to sensitive Kubernetes resources.
Vulnerability Details
CVE-ID: CVE-2026-49824
Affected Software: Fission
Affected Versions: Prior to version 1.24.0
Vulnerability: The Fission Function admission webhook fails to validate the
spec.environment.namespacefield. This allows users to reference resources across different namespaces, effectively bypassing the intended security isolation of the Kubernetes-native environment.Business Impact
The CVSS score of 8.5 indicates a high-severity risk. Exploitation allows an attacker to access configuration maps or secrets from namespaces they should not have visibility into, potentially leading to the compromise of credentials or sensitive data used by other serverless functions.
Remediation Plan
Immediate Action: Upgrade the Fission framework to version 1.24.0 or later to ensure correct namespace validation in the admission webhook.
Proactive Monitoring: Monitor Kubernetes logs and audit trails for unauthorized attempts to access cross-namespace resources or anomalous function deployment patterns.
Compensating Controls: Implement strict Kubernetes RBAC policies and NetworkPolicies to limit the blast radius of potential cross-namespace access.
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of June 12, 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 vulnerability undermines the multi-tenancy security model of Kubernetes-based serverless environments. Users of Fission should prioritize the upgrade to version 1.24.0 to restore proper security boundaries and prevent unauthorized access to sensitive application secrets.