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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00171.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Microsoft Azure AI Language Authoring affected
Version Status Constraints
1.0.0 affected < 1.0.0b4

Configuration 1 [-]

OR 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:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Microsoft Subscribe
Azure Ai Language Authoring Subscribe

Project Subscriptions

Vendors Products
Microsoft Subscribe
Azure Ai Language Authoring Subscribe
Azure Conversation Authoring Client Library Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-436v-jg82-p533 Azure AI Language Authoring Elevation of Privilege Vulnerability can Lead to RCE
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21531 cve-icon cve-icon
History

Thu, 12 Feb 2026 16:00:00 +0000

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

Tue, 10 Feb 2026 18:15:00 +0000

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-02-20T21:52:31.037Z

Reserved: 2025-12-30T18:10:54.847Z

Link: CVE-2026-21531

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2026-02-10T18:16:35.580

Modified: 2026-02-12T15:49:25.373

Link: CVE-2026-21531

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-10T21:33:45Z

Weaknesses