CVE-2026-55446
Langflow: Unauthenticated DoS through multipart form boundary file upload
- State
- Published
- Severity
- 7.5 High
- Published
- Jun 23, 2026
- Updated
- Jun 23, 2026
- Reserved
- Jun 16, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
Weaknesses
- CWE-400 Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
langflowlangflow-ai |
|
References
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