| Component | Langflow |
| Severity | high (CVSS 7.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published (NVD) | 2026-06-23 |
| Last modified | 2026-06-24 |
| Affected versions | langflow < 1.0.19 |
| Fixed in | 1.0.19 |
| Weakness | CWE-400 |
| CISA KEV | not listed |
NVD description
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.
What to do
- Upgrade Langflow to
1.0.19or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-55446
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9
- https://github.com/langflow-ai/langflow/pull/3923
Read more
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