CVE-2026-67643: Microsoft SQL Server 2022

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft SQL Server 2022: before 16.0.1200.5 (fixed in 16.0.1200.5); from 16.0.4003.1, before 16.0.4275.2 (fixed in 16.0.4275.2)
• Microsoft SQL Server 2025: before 17.0.1135.8 (fixed in 17.0.1135.8); from 17.0.4006.2, before 17.0.4085.5 (fixed in 17.0.4085.5)

Published 2026-09-08. Last modified 2026-09-17.