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CVE-2026-21226: Azure Core shared client library for Python Remote Code Execution Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-13 · updated 2026-07-30
• Weakness: CWE-502

Description

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

Affected products

• Microsoft Azure Core shared client library for Python: from 1.1.0 before 1.38.0 — fixed in 1.38.0
• Microsoft Azure Core shared client library for Python: from 1.1.0 before 1.38.0 — fixed in 1.38.0

How to fix

Upgrade to a fixed version: Microsoft Azure Core shared client library for Python 1.38.0; Microsoft Azure Core shared client library for Python 1.38.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226

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