CVE-2026-55446

Langflow: Unauthenticated DoS through multipart form boundary file upload

CVSS 7.5 HIGHEPSS 0.3%CWE-400

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

langflow-ai · langflow

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References

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