Vulnerability · Published Feb 19, 2026 · Assigned by GitHub_M
CVE-2026-26030Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution
Critical 10.0
In plain English
A critical-severity code injection in semantic-kernel from microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.9% (higher than 90% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | semantic-kernel | 1.39.4 | GHSA-xjw9-4gw8-4rqx |
| PyPI | semantic-kernel | 1.39.4 | PYSEC-2026-163 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| microsoft | semantic-kernel | < 1.39.4 |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References
- https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx x_refsource_CONFIRM
- https://github.com/microsoft/semantic-kernel/pull/13505 x_refsource_MISC
- https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4 x_refsource_MISC