Am I affected by Langflow: Unauthenticated file upload leads to DoS (space exhaustion) and information leak? What should I do?
Unauthenticated users can upload any amount of data to the server without any limitations.
Affected: langflow < 1.9.1. Fixed in: 1.9.1. What should you check, and what should you do about it?
Full incident page with sources: https://agentarmorhq.com/incidents/2026/06/cve-2026-55450-langflow (opens external site)
1 answer
Am I affected? Affected: langflow < 1.9.1. Fixed in: 1.9.1.
- Check your version: run
pip show langflow. Versions < 1.9.1 of langflow are affected.
What to do now
- Upgrade to the fixed version: run
pip install --upgrade "langflow>=1.9.1"(first patched version 1.9.1). - Upgrade to 1.9.1 or later.
General practice, not from the source: if the affected software could read tokens or credentials, rotate them after upgrading; pin versions and review changes before updating tools your agents run.
Sources
- GitHub Advisory Database: https://github.com/advisories/GHSA-x223-p2gf-v735 (opens external site)
Full incident page: https://agentarmorhq.com/incidents/2026/06/cve-2026-55450-langflow (opens external site)
Did this work for you?- Check your version: run