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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/langflow-ai/langflow/pull/3923 Issue Tracking, Patch
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9 Exploit, Patch, Vendor Advisory
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9 Exploit, Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · langflowNVD modified 2026-10-25 23:10
Affected (CPE criteria) 1
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*
References 3
- https://github.com/langflow-ai/langflow/pull/3923 Issue Tracking, Patch
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9 Exploit, Patch, Vendor Advisory
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9 Exploit, Patch, Vendor Advisory