CVE-2026-21531 CRITICAL

CVE-2026-21531: Azure SDK for Python Remote Code Execution Vulnerability

Vendor Microsoft
Product Azure AI Language Authoring
Weakness CWE-502 · Unsafe deserialization
Published February 10, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

What the vulnerability does

Description

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

Key dates

Disclosure timeline

February 10, 2026 CVE published
May 11, 2026 Record updated