CVE-2026-67641: Microsoft SQL Server Denial of Service Vulnerability

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

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

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2026-Sep

Released

2026-09-08

Description

Integer overflow or wraparound in SQL Server allows an authorized attacker to deny service over a network.

Affected Products (4)

SQL Server

• Microsoft SQL Server 2022 for x64-based Systems (GDR)
• Microsoft SQL Server 2025 for x64-based Systems (GDR)
• Microsoft SQL Server 2025 for x64-based Systems (CU8)
• Microsoft SQL Server 2022 for x64-based Systems (CU 26)

Security Updates (4)

• 5122771
• 5122770
• 5122769
• 5122768

Acknowledgments

Microsoft Red Team

Revision History

• 2026-09-08: Information published.