A high-severity SSRF vulnerability in IBM Langflow OSS, identified as CVE-2026-19304, permits authenticated attackers to access sensitive internal service data.

This vulnerability is a Server-Side Request Forgery (CWE-918) caused by a URL parser discrepancy. The flaw allows a remote attacker with authenticated access to bypass intended restrictions and interact with internal network services.

The vulnerability carries a CVSS score of 7.7, reflecting a high risk of unauthorized information disclosure. By leveraging SSRF, an attacker can potentially reach internal APIs or services that are not exposed to the public internet, leading to the compromise of proprietary data, configuration details, or other sensitive internal assets.

Immediate Action: Upgrade IBM Langflow OSS to version 1.11.3 or later as specified in the official vendor advisory to resolve the URL parsing flaw.

Proactive Monitoring: Review application access logs for unusual outbound request patterns or attempts to access internal IP addresses (such as 127.0.0.1 or internal private subnets) originating from the Langflow service.

Compensating Controls: Implement strict egress filtering on the host machine to prevent the application from making unauthorized requests to internal network segments or unauthorized external domains.

Public Exploit Available: No (exploit_available: false)

Given the potential for unauthorized access to internal services, this vulnerability poses a significant risk to organizational confidentiality. Administrators should prioritize the upgrade to version 1.11.3 immediately. Applying this update is the only definitive way to mitigate the underlying URL parsing discrepancy and secure the application against potential exploitation.