CVE-2026-21226: Azure Core is vulnerable to deserialization of untrusted data

January 13, 2026

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

References

github.com/Azure/azure-sdk-for-python
github.com/Azure/azure-sdk-for-python/blob/6d2e6431ea0991861640e449e51e894247a7771a/sdk/core/azure-core/CHANGELOG.md
github.com/advisories/GHSA-jm66-cg57-jjv5
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226
nvd.nist.gov/vuln/detail/CVE-2026-21226

Code Behaviors & Features

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