PYSEC-2026-163

Vulnerability from pysec - Published: 2026-02-19 17:24 - Updated: 2026-05-24 16:09
VLAI
Details

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.

Severity
9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Impacted products
Name purl
semantic-kernel pkg:pypi/semantic-kernel
Aliases
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {},
      "package": {
        "ecosystem": "PyPI",
        "name": "semantic-kernel",
        "purl": "pkg:pypi/semantic-kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.39.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.1.dev0",
        "0.1.0.dev0",
        "0.2.0.dev0",
        "0.2.1.dev0",
        "0.2.2.dev0",
        "0.2.3.dev0",
        "0.2.4.dev0",
        "0.2.5.dev0",
        "0.2.6.dev0",
        "0.2.7.dev0",
        "0.2.8.dev0",
        "0.2.9.dev0",
        "0.3.0.dev0",
        "0.3.1.dev0",
        "0.3.10.dev0",
        "0.3.11.dev0",
        "0.3.12.dev0",
        "0.3.13.dev0",
        "0.3.14.dev0",
        "0.3.15.dev0",
        "0.3.2.dev0",
        "0.3.3.dev0",
        "0.3.4.dev0",
        "0.3.5.dev0",
        "0.3.6.dev0",
        "0.3.7.dev0",
        "0.3.8.dev0",
        "0.3.9.dev0",
        "0.4.0.dev0",
        "0.4.1.dev0",
        "0.4.2.dev0",
        "0.4.3.dev0",
        "0.4.4.dev0",
        "0.4.5.dev0",
        "0.4.6.dev0",
        "0.4.7.dev0",
        "0.5.0.dev0",
        "0.5.1.dev0",
        "0.9.0b1",
        "0.9.1b1",
        "0.9.2b1",
        "0.9.3b1",
        "0.9.4b1",
        "0.9.5b1",
        "0.9.6b1",
        "0.9.7b1",
        "0.9.8b1",
        "0.9.9b1",
        "1.0.0",
        "1.0.0rc1",
        "1.0.1",
        "1.0.2",
        "1.0.3",
        "1.0.4",
        "1.0.5",
        "1.1.0",
        "1.1.1",
        "1.1.2",
        "1.10.0",
        "1.10.1",
        "1.11.0",
        "1.12.0",
        "1.12.1",
        "1.13.0",
        "1.14.0",
        "1.15.0",
        "1.16.0",
        "1.17.0",
        "1.17.1",
        "1.18.0",
        "1.18.1",
        "1.18.2",
        "1.19.0",
        "1.2.0",
        "1.20.0",
        "1.21.0",
        "1.21.1",
        "1.21.2",
        "1.21.3",
        "1.22.0",
        "1.22.1",
        "1.23.0",
        "1.23.1",
        "1.24.0",
        "1.24.1",
        "1.25.0",
        "1.26.0",
        "1.26.1",
        "1.27.0",
        "1.27.1",
        "1.27.2",
        "1.28.0",
        "1.28.1",
        "1.29.0",
        "1.3.0",
        "1.30.0",
        "1.31.0",
        "1.32.0",
        "1.32.1",
        "1.32.2",
        "1.33.0",
        "1.34.0",
        "1.35.0",
        "1.35.1",
        "1.35.2",
        "1.35.3",
        "1.36.0",
        "1.36.1",
        "1.36.2",
        "1.37.0",
        "1.37.1",
        "1.38.0",
        "1.39.0",
        "1.39.1",
        "1.39.2",
        "1.39.3",
        "1.4.0",
        "1.5.0",
        "1.5.1",
        "1.6.0",
        "1.7.0",
        "1.8.0",
        "1.8.1",
        "1.8.2",
        "1.8.3",
        "1.9.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26030",
    "GHSA-xjw9-4gw8-4rqx"
  ],
  "details": "Semantic Kernel, Microsoft\u0027s 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.",
  "id": "PYSEC-2026-163",
  "modified": "2026-05-24T16:09:56.119731Z",
  "published": "2026-02-19T17:24:50.487Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/microsoft/semantic-kernel/releases/tag/python-1.39.4"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/semantic-kernel/pull/13505"
    },
    {
      "type": "FIX",
      "url": "https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-xjw9-4gw8-4rqx"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.