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

Code Behaviors & Features

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