CVE-2026-5027

Langflow - Path Traversal Arbitrary File Write via upload_user_file

Published Mar 27, 2026 CVSS 3.1 · 8.8 High EPSS 40.7% KEV · Not listed
Description
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 ('../').

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:langflow:langflow:*:-:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Langflow
Langflow langflow
Vendors & Products Langflow
Langflow langflow
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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 ('../').
Title Langflow - Path Traversal Arbitrary File Write via upload_user_file
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
tenable
Published
Updated
Mar 27, 2026, 3:11 PM
Reserved
Mar 27, 2026, 2:51 PM
Status
Analyzed
Published
Mar 27, 2026, 3:17 PM
Modified
Aug 18, 2026, 6:00 PM