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

January 6, 2026 (updated January 29, 2026)

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.

This appears to be an implementation oversight, as safe extraction is already implemented and used elsewhere in MONAI.

CWE: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

References

github.com/Project-MONAI/MONAI
github.com/Project-MONAI/MONAI/commit/4014c8475626f20f158921ae0cf98ed259ae4d59
github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27
github.com/advisories/GHSA-9rg3-9pvr-6p27
nvd.nist.gov/vuln/detail/CVE-2026-21851

Code Behaviors & Features

Detect and mitigate CVE-2026-21851 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →