CVE-2026-55446

PoC —

CVSS 3.1

7.5 high

EPSS

<1%p46

Published

Jun 23, 2026 (Jun 23, 2026)

Modified

Jun 24, 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.

Vendors: langflow
Products: langflow
Weakness: CWE-400
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.6%)

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