CVE-2026-26030
Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution
Impact
### 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](https://github.com/microsoft/semantic-kernel/releases/tag/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](https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4) [PR to block use of dangerous attribute names that must not be accessed in filter expressions](https://github.com/microsoft/semantic-kernel/pull/13505)
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | semantic-kernel | < 1.39.4 | 1.39.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Semantic Kernel | before 1.39.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/microsoft/semantic-kernel/pull/13505
- https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4
- https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx
- https://github.com/advisories/GHSA-xjw9-4gw8-4rqx
- https://nvd.nist.gov/vuln/detail/CVE-2026-26030
- https://github.com/pypa/advisory-database/tree/main/vulns/semantic-kernel/PYSEC-2026-163.yaml