CVE-2026-21531

Azure SDK for Python Remote Code Execution Vulnerability

Published Feb 10, 2026 CVSS 3.1 · 9.8 Critical EPSS 2.5% KEV · Not listed
Description
Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-436v-jg82-p533 Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Microsoft azure Conversation Authoring Client Library
CPEs cpe:2.3:a:microsoft:azure_conversation_authoring_client_library:1.0.0:beta1:*:*:*:python:*:*
cpe:2.3:a:microsoft:azure_conversation_authoring_client_library:1.0.0:beta2:*:*:*:python:*:*
cpe:2.3:a:microsoft:azure_conversation_authoring_client_library:1.0.0:beta3:*:*:*:python:*:*
Vendors & Products Microsoft azure Conversation Authoring Client Library
Type Values Removed Values Added
Description Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.
Title Azure SDK for Python Remote Code Execution Vulnerability
First Time appeared Microsoft
Microsoft azure Ai Language Authoring
Weaknesses CWE-502
CPEs cpe:2.3:a:microsoft:azure_ai_language_authoring:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft azure Ai Language Authoring
References
Metrics cvssV3_1

{'score': 9.8, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Aug 19, 2026, 4:26 PM
Reserved
Dec 30, 2025, 6:10 PM
Status
Analyzed
Published
Feb 10, 2026, 6:16 PM
Modified
Jun 17, 2026, 10:18 AM