{"id":"GHSA-jm66-cg57-jjv5","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.","aliases":["CVE-2026-21226","PYSEC-2026-1208"],"modified":"2026-07-17T21:09:59.721753139Z","published":"2026-01-13T21:31:44Z","database_specific":{"cwe_ids":["CWE-502"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-01-13T21:57:47Z","nvd_published_at":"2026-01-13T19:16:23Z"},"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"}],"affected":[{"package":{"name":"azure-core","ecosystem":"PyPI","purl":"pkg:pypi/azure-core"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.38.0"}]}],"versions":["1.0.0","1.0.0b1","1.0.0b2","1.0.0b3","1.0.0b4","1.1.0","1.1.1","1.10.0","1.11.0","1.12.0","1.12.0b1","1.13.0","1.13.0b1","1.14.0","1.14.0b1","1.15.0","1.15.0b1","1.16.0","1.17.0","1.18.0","1.19.0","1.19.1","1.2.0","1.2.1","1.2.2","1.20.0","1.20.1","1.21.0","1.21.1","1.22.0","1.22.1","1.23.0","1.23.1","1.24.0","1.24.1","1.24.2","1.25.0","1.25.1","1.26.0","1.26.1","1.26.2","1.26.3","1.26.4","1.27.0","1.27.1","1.28.0","1.29.0","1.29.1","1.29.2","1.29.3","1.29.4","1.29.5","1.29.6","1.29.7","1.3.0","1.30.0","1.30.1","1.30.2","1.31.0","1.32.0","1.33.0","1.34.0","1.35.0","1.35.1","1.36.0","1.37.0","1.4.0","1.5.0","1.6.0","1.7.0","1.8.0","1.8.1","1.8.2","1.9.0"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-jm66-cg57-jjv5/GHSA-jm66-cg57-jjv5.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}