CVE-2026-78456: SQL Server Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Sep

Released

2026-09-08

Description

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

FAQ

How could an attacker exploit this vulnerability? An authenticated attacker could exploit this vulnerability by connecting to an affected SQL Server and submitting a specially crafted query or request that triggers a memory corruption condition, allowing the attacker to execute code on the server. Authentication is required; user interaction is not required.

Affected Products (2)

SQL Server

• Microsoft SQL Server 2022 for x64-based Systems (CU 26)
• Microsoft SQL Server 2022 for x64-based Systems (GDR)

Security Updates (2)

• 5122768
• 5122771

Acknowledgments

Pwnforr777

Revision History

• 2026-09-08: Information published.