CVE-2026-5027 HIGH

CVE-2026-5027: Langflow - Path Traversal Arbitrary File Write via upload_user_file

Vendor Langflow-Ai
Product langflow
Weakness CWE-22 · Path traversal
Published March 27, 2026
Last update March 27, 2026

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

The 'POST /api/v2/files' endpoint does not sanitize the 'filename' parameter from the multipart form data, allowing an attacker to write files to arbitrary locations on the filesystem using path traversal sequences ('../').

Key dates

02Disclosure timeline

March 27, 2026 CVE published
March 27, 2026 Record updated