CVE-2026-67633: Microsoft SQL Server Denial of Service Vulnerability
Published Sep 8, 2026
·Updated
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
16 affected componentsFixes available
Microsoft SQL Server 2022 (CU 26)<16.0.4275.2
16.0.4275.2
Microsoft SQL Server 2025 (CU8)<17.0.4085.5
17.0.4085.5
Microsoft SQL Server 2019<15.0.2190.7
15.0.2190.7
Microsoft SQL Server 2019 (CU 32)<15.0.4490.9
15.0.4490.9
Microsoft SQL Server 2017<14.0.2130.4
14.0.2130.4
Microsoft SQL Server 2017 (CU 31)<14.0.3550.4
14.0.3550.4
Microsoft SQL Server 2022<16.0.1200.5
16.0.1200.5
Microsoft SQL Server 2025<17.0.1135.8
17.0.1135.8
Microsoft SQL Server 2017<14.0.2130.4
Microsoft SQL Server 2017>=14.0.3006.16<14.0.3550.4
Microsoft SQL Server 2019<15.0.2190.7
Microsoft SQL Server 2019>=15.0.4003.23<15.0.4490.9
Microsoft SQL Server 2022<16.0.1200.5
Microsoft SQL Server 2022>=16.0.4003.1<16.0.4275.2
Microsoft SQL Server 2025<17.0.1135.8
Microsoft SQL Server 2025>=17.0.4006.2<17.0.4085.5
Remediation
Event History
Sep 8, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·05:10 PM
Data Sourced
via MITRE·05:10 PM
DescriptionSeverity
Data Sourced
via NVD·06:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What level of access does an attacker need?
An attacker needs network access and authorized, low-level privileges. No user interaction is required.
2
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.
3
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.