HIGH 7.5

PYSEC-2026-223

Details

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.

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Affected packages

PyPI / langflow

Introduced in: 0 Fixed in: 1.0.19

Fix pip install --upgrade 'langflow>=1.0.19'

References

https://github.com/langflow-ai/langflow/pull/3923 [FIX]
https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9 [FIX]