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CVE-2026-55446

High

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.

SeverityHigh
CVSS7.5
Exploit probability—
ProductLangflow
PublishedJun 23, 2026
First seenJun 23, 2026
Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Update
  • langflow langflow1.0.19 or later
  • langflow1.0.19 or later

Affected products

ProductAffected versionsFixed in
langflow langflowv < 1.0.191.0.19
langflowPyPIv < 1.0.191.0.19

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