How severe is CVE-2026-21851?

CVE-2026-21851 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-21851 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21851?

CVE-2026-21851 affects Project-monai Monai. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21851?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21851 have an EU (EUVD) identifier?

Yes. CVE-2026-21851 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1039.

When was CVE-2026-21851 published?

CVE-2026-21851 was published on 2026-01-07 and last updated on 2026-06-17.

CVE-2026-21851

CVE-2026-21851 is a medium-severity vulnerability in Project-monai Monai with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1039
Weakness: CWE-22
Affected product: Project-monai Monai
Published: 2026-01-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-21851?: 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.
How severe is CVE-2026-21851?: CVE-2026-21851 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-21851 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21851?: CVE-2026-21851 affects Project-monai Monai. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21851?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21851 have an EU (EUVD) identifier?: Yes. CVE-2026-21851 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1039.
When was CVE-2026-21851 published?: CVE-2026-21851 was published on 2026-01-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:project-monai:monai:*:*:*:*:*:*:*:*

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