CVE-2026-67633: Microsoft SQL Server Denial of Service Vulnerability
Microsoft SQL Server Denial of Service Vulnerability
Other sources
Out-of-bounds read in SQL Server allows an authorized attacker to deny service over a network.
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.4275.2Patch KB5122768 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 15.0.2190.7Patch KB5122773 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 17.0.4085.5Patch KB5122769 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 15.0.4490.9Patch KB5122772 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.1200.5Patch KB5122771 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 14.0.2130.4Patch KB5122775 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 14.0.3550.4Patch KB5122774 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 17.0.1135.8Patch KB5122770
Event History
Frequently Asked Questions
What level of access does an attacker need?
An attacker needs network access and authorized, low-level privileges. No user interaction is required.
What is the expected security impact?
The vulnerability is assessed as affecting availability, with a high availability impact. The supplied vector indicates no confidentiality or integrity impact.
Which SQL Server releases are listed as affected?
The affected software list includes Microsoft SQL Server 2017, 2019, 2022, and 2025. It specifically lists SQL Server 2017 CU 31, SQL Server 2019 CU 32, SQL Server 2022 CU 26, and SQL Server 2025 CU8, as well as generic entries for those releases.