CVE-2026-21851

low-risk
Published 2026-01-07

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.

Do I need to act?

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0.02% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / HIGH complexity

Affected Products (1)

Monai

Affected Vendors

Project-Monai

References (3)

Patch https://github.com/Project-MONAI/MONAI/commit/4014c8475626f20f158921ae0cf98ed259...
Exploit https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27
Exploit https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27
22
/ 100
low-risk
Severity 17/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal