What is CVE-2026-21226?

CVE-2026-21226 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Azure Core shared client library for Python Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-21226 cover?

CVE-2026-21226 covers the following CVE IDs: CVE-2026-21226. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21226?

CVE-2026-21226 has a CVSS v3 base score of 7.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21226?

CVE-2026-21226 affects 1 product, including: Azure Core shared client library for Python.

CVE-2026-21226HighCVSS 7.5

Azure Core shared client library for Python Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21226 →

📋 Description

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

🎯 Affected products1

Azure Core shared client library for Python

✅ Remediation

KBChange Log (Security Update) — fixed build 1.38.0

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21226
patchhttps://github.com/Azure/azure-sdk-for-python/blob/main/sdk/core/azure-core/CHANGELOG.md#1380-2026-01-08