CVE-2026-55446

HIGH

Langflow: Unauthenticated DoS through multipart form boundary file upload

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/langflow-ai/langflow/pull/3923

Scores

CVSS v3 7.5
EPSS 0.0035
EPSS Percentile 27.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (2)
langflow/langflow < 1.0.19
langflow-ai/langflow < 1.0.19
Published Jun 23, 2026
Tracked Since Jun 23, 2026