CVE-2026-67633 Microsoft SQL Server Denial of Service Vulnerability
An authorized attacker can cause a denial of service in Microsoft SQL Server via an out-of-bounds read vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-67633?
CVE-2026-67633 is a medium-severity denial of service vulnerability in Microsoft Sql Server 2017, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Out-of-bounds read in SQL Server allows an authorized attacker to deny service over a network.
Weakness: CWE-125
Which versions are affected by CVE-2026-67633?
It affects 4 products.
Products include Microsoft Sql Server 2017, Microsoft Sql Server 2019, Microsoft Sql Server 2022, Microsoft Sql Server 2025.
How do I fix CVE-2026-67633?
No fix has been published for CVE-2026-67633 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-67633 being exploited?
There is no known exploitation of CVE-2026-67633 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sql Server 2017
- CVE-2026-67631 Microsoft SQL Server Remote Code Execution Vulnerability
- CVE-2026-66814 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-66818 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-66819 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-66820 SQL Server Elevation of Privilege Vulnerability
Sources
Also known as GHSA-c5hp-67h3-xjp7.