{"id":"CVE-2026-26030","aliases":["GHSA-xjw9-4gw8-4rqx","PYSEC-2026-163"],"url":"https://o3.security/vulnerability/CVE-2026-26030","summary":"Microsoft Semantic Kernel InMemoryVectorStore filter functionality vulnerable to remote code execution","details":"### Impact:\nAn RCE vulnerability has been identified in Microsoft Semantic Kernel Python SDK, specifically within the `InMemoryVectorStore` filter functionality.\n\n### Patches:\nThe 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.\n\n### Workarounds:\nAvoid using `InMemoryVectorStore` for production scenarios.\n\n### References:\n[Release python-1.39.4 · microsoft/semantic-kernel · GitHub](https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4)\n[PR to block use of dangerous attribute names that must not be accessed in filter expressions](https://github.com/microsoft/semantic-kernel/pull/13505)","published":"2026-02-19T16:00:55.623Z","modified":"2026-08-12T03:51:31.370362873Z","cvss":{"score":9.9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"semantic-kernel","fixedVersion":"1.39.4"}],"fix":{"url":"https://github.com/microsoft/semantic-kernel/pull/13505","label":"microsoft/semantic-kernel#13505"},"references":[{"type":"WEB","url":"https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26030.json"},{"type":"ADVISORY","url":"https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-26030"},{"type":"FIX","url":"https://github.com/microsoft/semantic-kernel/pull/13505"},{"type":"PACKAGE","url":"https://github.com/microsoft/semantic-kernel"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/semantic-kernel/PYSEC-2026-163.yaml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:31.370362873Z"}}