CVE-2026-55450

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, unauthenticated users can upload any amount of data to the server without any limitations. No need for any prior knowledge, only network access to Langflow. This can lead to space exhaustion on the server. In addition, in the response, the absolute path of the uploaded file is reported to the attacker, which is an information leak that can assist in chaining other primitives. This vulnerability is fixed in 1.9.1.

CVSS 3.1

9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H

EPSS

1.2% chance of exploitation in the next 30 days; higher than 67% of CVEs (scores of 2026-10-25)

CWEs

CWE-200, CWE-306, 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/12831
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735
• https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735

Check your stackJSON