Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution
Impact:
An RCE vulnerability has been identified in Microsoft Semantic Kernel Python SDK, specifically within the InMemoryVectorStore filter functionality.
Patches:
The problem has been fixed in python-1.39.4. Users should upgrade this version or higher.
Workarounds:
Avoid using InMemoryVectorStore for production scenarios.
References:
Release python-1.39.4 · microsoft/semantic-kernel · GitHub PR to block use of dangerous attribute names that must not be accessed in filter expressions
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | semantic-kernel | < 1.39.4 | 1.39.4 |
References
- https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4
- https://github.com/microsoft/semantic-kernel/pull/13505
- https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx
- https://nvd.nist.gov/vuln/detail/CVE-2026-26030
- https://github.com/microsoft/semantic-kernel
- https://github.com/pypa/advisory-database/tree/main/vulns/semantic-kernel/PYSEC-2026-163.yaml
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H- Weakness (CWE)
CWE-94- Platform
- Python (PyPI)
- Package
semantic-kernel- Disclosed
- 19.02.2026
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-163 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-xjw9-4gw8-4rqx - CC BY 4.0
Vulnerability history: semantic-kernel
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 02.2026 02.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 2
Disclosures per year
- 2026: 2
-
Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution this entry
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