What is the CVSS score of CVE-2026-21851?

CVE-2026-21851 has a CVSS 3.1 base score of 5.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of AI / ML are affected by CVE-2026-21851?

Organizations using versions should be aware of moderate risk from CVE-2026-21851, a path traversal vulnerability rated CVSS 5.3. This could allow unauthorized file access.. A patch is available.

Is there a public PoC exploit available for CVE-2026-21851?

Yes, a public proof-of-concept exploit is available for CVE-2026-21851. Prioritise patching immediately. EPSS: 0.0%.

AI / ML CVE-2026-21851

MEDIUM

Path Traversal (CWE-22)

2026-01-07 security-advisories@github.com

GHSA-9rg3-9pvr-6p27

Path Traversal AI / ML Monai

5.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.3 MEDIUM

AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 02, 2026 - 15:13 vuln.today

Public exploit code

Patch released

Feb 02, 2026 - 15:13 nvd

Patch available

CVE Published

Jan 07, 2026 - 23:15 nvd

MEDIUM 5.3

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

110 pypi packages depend on monai (100 direct, 10 indirect)

Ecosystem-wide dependent count for version 1.5.2.

DescriptionGitHub Advisory

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.

AnalysisAI

MONAI versions up to 1.5.1 contain a path traversal vulnerability in the _download_from_ngc_private() function that fails to validate extracted archive contents, allowing attackers to write files outside the intended directory during package extraction. An attacker with user interaction can exploit this via a malicious ZIP file to overwrite arbitrary files on the system. …

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Vulnerability AssessmentAI

Risk Assessment	CVSS 5.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this vulnerability to compromise the affected system.
Remediation	A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 30 days: Identify affected systems running versions and apply vendor patches as part of regular patch cycle. …

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CVE-2026-21851 vulnerability details – vuln.today

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AI / ML CVE-2026-21851

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

Blast Radius

DescriptionGitHub Advisory

AnalysisAI

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External POC / Exploit Code