CVE-2026-67641Important
Microsoft SQL Server Denial of Service Vulnerability
Assessment
Integer overflow or wraparound in SQL Server allows an authorized attacker to deny service over a network.
- Severity
- Important
- CVSS base score
- 6.5CVSS:3.1/
AV:N/ AC:L/ PR:L/ UI:N/ S:U/ C:N/ I:N/ A:H/ E:U/ RL:O/ RC:C - Impact
- Denial of Service
- EPSS, next 30 days
- 1.1%Higher than 65.3% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Exploitation Unlikely
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- SQL Server
- Weakness
- CWE-190: Integer Overflow or Wraparound
- Issued by
- Microsoft
- Published
- 8 Sep 2026 · September 2026
- Last revised
- 8 Sep 2026
Updates that fix it
4 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5122768 | Security Update | Required | Microsoft SQL Server 2022 for x64-based Systems (CU 26) | All CVEs in KB5122768 |
| KB5122769 | Security Update | Required | Microsoft SQL Server 2025 for x64-based Systems (CU8) | All CVEs in KB5122769 |
| KB5122770 | Security Update | Required | Microsoft SQL Server 2025 for x64-based Systems (GDR) | All CVEs in KB5122770 |
| KB5122771 | Security Update | Required | Microsoft SQL Server 2022 for x64-based Systems (GDR) | All CVEs in KB5122771 |
Affected products
SQL Server4 affected products
- Microsoft SQL Server 2022 for x64-based Systems (CU 26)
- Microsoft SQL Server 2022 for x64-based Systems (GDR)
- Microsoft SQL Server 2025 for x64-based Systems (CU8)
- Microsoft SQL Server 2025 for x64-based Systems (GDR)