CVE-2026-21851

Name: CVE-2026-21851
Creator: NVD / NIST
Published: 2026-01-07T23:15:50.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2026-21851 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.31%

22.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Project-Monai	Monai	<= 1.5.1

References

https://github.com/Project-MONAI/MONAI/commit/4014c8475626f20f158921ae0cf98ed259ae4d59Patch
https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27Exploit, Mitigation, Vendor Advisory
https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27Exploit, Mitigation, Vendor Advisory

Timeline

Published: Jan 7, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-21851?

How severe is CVE-2026-21851?

CVE-2026-21851 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2026-21851?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-21851?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST