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.

CVSS 3.1

7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.6% chance of exploitation in the next 30 days; higher than 47% of CVEs (scores of 2026-10-25)

CWE

CWE-400

Published

2026-06-23

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

Affected

• langflow:langflow

Packages (OSV)

References

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

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