CVE-2026-26030

Name: CVE-2026-26030
Creator: NVD / NIST
Published: 2026-02-19T17:24:50.487+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.9/10EPSS 2.91%

Last modified Jun 17, 2026

CVE-2026-26030 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. Semantic Kernel, Microsoft's semantic kernel Python SDK, has a remote code execution vulnerability in versions prior to 1.39.4, specifically within the `InMemoryVectorStore` filter functionality. The problem has been fixed in version `python-1.39.4`. EPSS estimates a 2.91% chance of exploitation in the next 30 days.

Description

Semantic Kernel, Microsoft's semantic kernel Python SDK, has a remote code execution vulnerability in versions prior to 1.39.4, specifically within the `InMemoryVectorStore` filter functionality. The problem has been fixed in version `python-1.39.4`. Users should upgrade this version or higher. As a workaround, avoid using `InMemoryVectorStore` for production scenarios.

Metrics

CVSS 3.1

9.9/10

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

EPSS Probability

2.91%

85.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Microsoft	Semantic Kernel	< 1.39.4

References

https://github.com/microsoft/semantic-kernel/pull/13505Issue Tracking, Patch
https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4Release Notes
https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqxPatch, Vendor Advisory

Timeline

Published: Feb 19, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-26030?

How severe is CVE-2026-26030?

CVE-2026-26030 has a CVSS score of 9.9/10 (CRITICAL severity). The EPSS model estimates a 2.91% probability of exploitation in the next 30 days.

How do I fix CVE-2026-26030?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-26030?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST