Critical severity · published Feb 19, 2026
CVE-2026-26030
Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution
9.9
CVSS
3.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)3.9% · higher than 90% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
semantic-kernel · microsoft
< 1.39.4 · source: vendor
SK
Semantic Kernel · Microsoft
before 1.39.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26030
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26030
Issue Tracking
https://github.com/microsoft/semantic-kernel/pull/13505
Release Notes
https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4
Patch
https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx
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