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CVE-2026-21851

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Date: January 7, 2026

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.

Severity Score

Related Resources (5)

https://github.com/Project-MONAI/MONAI/commit/4014c8475626f20f158921ae0cf98ed259ae4d59
https://github.com/Project-MONAI/MONAI
https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27
https://nvd.nist.gov/vuln/detail/CVE-2026-21851
https://www.mend.io/vulnerability-database/CVE-2026-21851

Severity Score

Weakness Type (CWE)

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-22

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

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