5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-21851

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

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-21851

CVE-2026-21851:

5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
monai	pip	<= 1.5.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The analysis of the vulnerability is based on the provided security advisory and the associated commit patch. The advisory explicitly points out that the _download_from_ngc_private function in monai/bundle/scripts.py uses the zipfile.ZipFile.extractall() method without proper path validation, which is the root cause of the Zip Slip vulnerability. The commit 4014c8475626f20f158921ae0cf98ed259ae4d59 directly addresses this issue by removing the vulnerable extractall call and replacing it with _extract_zip, a safer extraction utility that presumably validates archive paths. This change prevents attackers from crafting malicious zip files to write files outside the designated extraction directory.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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