CVE-2026-65674
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Microsoft SQL Server Deserialization Code Execution Vulnerability

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description
Deserialization of untrusted data in SQL Server allows an authorized attacker to execute code over a network.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-65674

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
Microsoft Microsoft SQL Server 2019 (GDR) 15.0.0
Microsoft Microsoft SQL Server 2019 for x64-based Systems (CU32) 15.0.4003.23
Microsoft Microsoft SQL Server 2022 (GDR) 16.0.0
Microsoft Microsoft SQL Server 2022 for x64-based Systems (CU27) 16.0.4003.1
Microsoft Microsoft SQL Server 2025 for x64-based Systems (CU9) 17.0.4006.2
Microsoft Microsoft SQL Server 2025 for x64-based Systems (GDR) 17.0.1050.2

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-502 The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

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Executive Summary

This vulnerability involves deserialization of untrusted data in SQL Server. An authorized attacker can exploit this to execute arbitrary code over a network.

Impact Analysis

An attacker could gain control over SQL Server, leading to data breaches, unauthorized access, or system compromise. This may result in data theft, manipulation, or service disruption.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Non-compliance may result in legal penalties and reputational damage.

Mitigation Strategies

Apply the latest cumulative updates for affected SQL Server versions to patch the deserialization flaw. Ensure network-level controls restrict unauthorized access to SQL Server ports and services.

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