CVE-2026-21851 MEDIUM

CVE-2026-21851: MONAI has Path Traversal (Zip Slip) in NGC Private Bundle Download

Vendor Project-Monai
Product MONAI
Weakness CWE-22 · Path traversal
Published January 7, 2026
Last update January 8, 2026
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality None
Integrity High

CVSS vector

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

What the vulnerability does

01Description

MONAI (Medical Open Network for AI) is an AI toolkit for health care imaging. In versions up to and including 1.5.1, a Path Traversal (Zip Slip) vulnerability exists in MONAI's `_download_from_ngc_private()` function. The function uses `zipfile.ZipFile.extractall()` without path validation, while other similar download functions in the same codebase properly use the existing `safe_extract_member()` function. Commit 4014c8475626f20f158921ae0cf98ed259ae4d59 fixes this issue.

Key dates

02Disclosure timeline

January 7, 2026 CVE published
January 8, 2026 Record updated