CVE-2026-55450

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.

• CWE-200
• CWE-306
• CWE-400

• https://github.com/langflow-ai/langflow/pull/12831Issue Tracking, Patch
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735Exploit, Patch, Vendor Advisory
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735Exploit, Patch, Vendor Advisory

Published

Jun 23, 2026

Last Modified

Jun 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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