CVE-2026-55446

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.0.19, an attacker can send a /api/v1/files/upload/ request without any authentication token/cookies and abuse a very long multipart form boundary to make the langflow app unusable for all users for an indefinite amount of time. This vulnerability is fixed in 1.0.19.

• CWE-400

• https://github.com/langflow-ai/langflow/pull/3923Issue Tracking, Patch
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9Exploit, Patch, Vendor Advisory
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9Exploit, 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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