| Component | Langflow |
| Severity | critical (CVSS 9.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:H |
| Published (NVD) | 2026-06-23 |
| Last modified | 2026-06-24 |
| Affected versions | langflow < 1.9.1 |
| Fixed in | 1.9.1 |
| Weakness | CWE-200CWE-306CWE-400 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade Langflow to
1.9.1or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-55450
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-x223-p2gf-v735
- https://github.com/langflow-ai/langflow/pull/12831
Read more
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