CVE-2026-78456: Microsoft SQL Server 2022

High severity, CVSS 8.8. EPSS: 0.9% 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 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)

Published 2026-09-08. Last modified 2026-09-15.