CVE-2026-55446: Langflow

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Langflow Langflow: before 1.0.19 (fixed in 1.0.19)

Published 2026-06-23. Last modified 2026-06-24.