7.5High
CVE-2026-55446Langflow: Unauthenticated DoS through multipart form boundary file upload
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.
Weakness (CWE):
CWE-400
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| langflow | langflow | < 1.0.19 | |
| langflow-ai | langflow | < 1.0.19 |
References and patches
- https://github.com/langflow-ai/langflow/security/advisories/GHSA-qwqc-p3q8-wcg9 ExploitPatchVendor Advisory
- https://github.com/langflow-ai/langflow/pull/3923 Issue TrackingPatch
CPE matches (NVD) (1)
cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*< 1.0.19