CVE-2026-83945: Microsoft SQL Server 2022 For x64-Based Systems CU27

Medium severity, CVSS 6.6. EPSS: 0.4% chance of exploitation in the next 30 days.

Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.

Affected products

• Microsoft Microsoft SQL Server 2022 For x64-Based Systems CU27: from 16.0.4003.1, before 16.0.4305.5 (fixed in 16.0.4305.5)
• Microsoft Microsoft SQL Server 2022 Gdr: from 16.0.0, before 16.0.1210.3 (fixed in 16.0.1210.3)
• Microsoft Microsoft SQL Server 2025 CU8: affected versions not specified
• Microsoft Microsoft SQL Server 2025 For x64-Based Systems CU9: from 17.0.4006.2, before 17.0.5015.4 (fixed in 17.0.5015.4)
• Microsoft Microsoft SQL Server 2025 For x64-Based Systems Gdr: from 17.0.1050.2, before 17.0.1145.4 (fixed in 17.0.1145.4)

Published 2026-10-13. Last modified 2026-10-16.