CVE-2026-21531

{"id": "CVE-2026-21531", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2026-02-10T18:16:35.580", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21531", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-502"}]}], "descriptions": [{"lang": "en", "value": "Deserialization of untrusted data in Azure SDK allows an unauthorized attacker to execute code over a network."}], "lastModified": "2026-02-12T15:49:25.373", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:azure_conversation_authoring_client_library:1.0.0:beta1:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "5F0D2A31-6685-4968-B9BD-8538BD0CD134"}, {"criteria": "cpe:2.3:a:microsoft:azure_conversation_authoring_client_library:1.0.0:beta2:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "6083B261-3037-4BFB-ACC5-B8945AE1046F"}, {"criteria": "cpe:2.3:a:microsoft:azure_conversation_authoring_client_library:1.0.0:beta3:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "CF3829C8-635B-4E0B-9C39-9FEA1A595C57"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}