What is CVE-2026-21531?

CVE-2026-21531 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Azure SDK for Python Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-21531 cover?

CVE-2026-21531 covers the following CVE IDs: CVE-2026-21531. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21531?

CVE-2026-21531 has a CVSS v3 base score of 9.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21531?

CVE-2026-21531 affects 1 product, including: Azure AI Language Authoring.

CVE-2026-21531HighCVSS 9.8

Azure SDK for Python Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

February 10, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-21531 →

📋 Description

Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

🎯 Affected products1

Azure AI Language Authoring

✅ Remediation

KBRelease Notes (Security Update) — fixed build 1.0.0b4

🔗 References (3)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21531
patchhttps://pypi.org/project/azure-ai-language-conversations-authoring/1.0.0b4/
referencehttps://github.com/Azure/azure-sdk-for-python/blob/main/sdk/cognitivelanguage/azure-ai-language-conversations-authoring/CHANGELOG.md