CVE-2026-26030
Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Timeline
ID reserved
By GitHub_M
- 10 days later
· 10 days later
Published
- 7 days later
· 7 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Critical10.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | Critical9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 3.9% · top 9.6% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 10.0.
Weakness
Affected products
- affected < 1.39.4
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- PyPIsemantic-kernelGHSA-xjw9-4gw8-4rqx (opens in a new tab)
References (3)
- https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx (opens in a new tab)x_refsource_CONFIRM
- https://github.com/microsoft/semantic-kernel/pull/13505 (opens in a new tab)x_refsource_MISC
- https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-xjw9-4gw8-4rqx (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-26030)Record last updated .