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

Quick assessment

Affected
Project-MONAI MONAI
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MONAI是Project MONAI开源的一个医疗成像AI工具包。 MONAI 1.5.1及之前版本存在路径遍历漏洞，该漏洞源于_download_from_ngc_private函数使用zipfile.ZipFile.extractall时未进行路径验证，可能导致路径遍历攻击。

CVSS 5.3 · Medium EPSS 0.36% · P28

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-21851

Vulnerability Information
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Vulnerability Title
MONAI has Path Traversal (Zip Slip) in NGC Private Bundle Download
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
MONAI 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MONAI是Project MONAI开源的一个医疗成像AI工具包。 MONAI 1.5.1及之前版本存在路径遍历漏洞，该漏洞源于_download_from_ngc_private函数使用zipfile.ZipFile.extractall时未进行路径验证，可能导致路径遍历攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Project-MONAI MONAI <= 1.5.1 -

II. Public POCs for CVE-2026-21851

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III. Intelligence Information for CVE-2026-21851

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Patches & Fixes for CVE-2026-21851 (1)

Vendor Advisories for CVE-2026-21851 (1)

IV. Related Vulnerabilities

Same product: MONAI
Same vendor: Project-MONAI
Same weakness: CWE-22

V. Comments for CVE-2026-21851

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