Vulnerability Description
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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Langflow | Langflow | < 1.9.1 |
Related Weaknesses (CWE)
References
- https://github.com/langflow-ai/langflow/pull/12831Issue TrackingPatch
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735ExploitPatchVendor Advisory
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735ExploitPatchVendor Advisory
FAQ
What is CVE-2026-55450?
CVE-2026-55450 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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 an...
How severe is CVE-2026-55450?
CVE-2026-55450 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-55450?
Check the references section above for vendor advisories and patch information. Affected products include: Langflow Langflow.