CVE-2026-67639 Microsoft SQL Server Remote Code Execution Vulnerability
An authorized attacker can execute arbitrary code remotely via a heap-based buffer overflow in Microsoft SQL Server.
- 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-2026-67639?
CVE-2026-67639 is a high-severity memory corruption 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
Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2026-67639?
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-2026-67639?
No fix has been published for CVE-2026-67639 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-67639 being exploited?
There is no known exploitation of CVE-2026-67639 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-8jxv-x8fp-rxf8.