CVE-2026-94520 Microsoft SQL Server Denial of Service Vulnerability
An authorized attacker can cause a denial of service in Microsoft SQL Server by exploiting a format string vulnerability.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-94520?
CVE-2026-94520 is a medium-severity denial of service vulnerability in Microsoft SQL Server 2017 (GDR), published on 13 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Use of externally-controlled format string in SQL Server allows an authorized attacker to deny service over a network.
Weakness: CWE-134
Which versions are affected by CVE-2026-94520?
How do I fix CVE-2026-94520?
No fix has been published for CVE-2026-94520 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-2026-94520 being exploited?
There is no known exploitation of CVE-2026-94520 in the wild and no public exploit code.
Sources
Also known as GHSA-vxwq-jqhm-w2r6.