CVE-2026-21531
Critical
Description
Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Microsoft Azure Conversation Authoring Client Library
PublishedFeb 10, 2026
First seenFeb 10, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- azure-ai-language-conversations-authoring1.0.0b4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft azure_conversation_authoring_client_library | 1.0.0 | — |
| azure-ai-language-conversations-authoringPyPI | v < 1.0.0b4 | 1.0.0b4 |
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