Path Traversal in Project-Monai Monai
CVE-2026-21851
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
- Project-Monai Monai — versions <= 1.5.1
Weakness classification (CWE)
References
- github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27 (Exploit, Mitigation, Vendor Advisory)
- github.com/Project-MONAI/MONAI/commit/4014c8475626f20f158921ae0cf98ed259ae4d59 (Patch)
Frequently asked questions
- What is CVE-2026-21851?
- CVE-2026-21851 is a medium-severity vulnerability in Project-Monai Monai, classified under Path Traversal. CVSS score: 5.3/10. Published 2026-01-07.
- How severe is CVE-2026-21851?
- Medium severity. CVSS v3 base score is 5.3 out of 10.