Langflow — Vulnerability (CVE-2026-55446)
Date: 2026-06
Affected: langflow/langflow
Attack vector: dos
Category: vulnerability-disclosure
Severity: High
CVE: CVE-2026-55446
CWE: CWE-400
CVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

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.


Mitigations:

Architectural layers (MAESTRO):