GHSA-JM66-CG57-JJV5

Vulnerability from github – Published: 2026-01-13 21:31 – Updated: 2026-01-13 21:57
VLAI
Summary
Azure Core is vulnerable to deserialization of untrusted data
Details

Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "azure-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.38.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-21226"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-13T21:57:47Z",
    "nvd_published_at": "2026-01-13T19:16:23Z",
    "severity": "HIGH"
  },
  "details": "Deserialization of untrusted data in Azure Core shared client library for Python allows an authorized attacker to execute code over a network.",
  "id": "GHSA-jm66-cg57-jjv5",
  "modified": "2026-01-13T21:57:47Z",
  "published": "2026-01-13T21:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21226"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Azure/azure-sdk-for-python"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Azure/azure-sdk-for-python/blob/6d2e6431ea0991861640e449e51e894247a7771a/sdk/core/azure-core/CHANGELOG.md#1380-2026-01-12"
    },
    {
      "type": "WEB",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Azure Core is vulnerable to deserialization of untrusted data"
}


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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

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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.
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  • 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.


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