CVE-2026-67643 Microsoft SQL Server Remote Code Execution Vulnerability
An unauthorized attacker can execute arbitrary code remotely via a heap-based buffer overflow in Microsoft SQL Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-67643?
CVE-2026-67643 is a critical memory corruption vulnerability in Microsoft Sql Server 2022, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2026-67643?
It affects 2 products.
Products include Microsoft Sql Server 2022, Microsoft Sql Server 2025.
How do I fix CVE-2026-67643?
No fix has been published for CVE-2026-67643 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-2026-67643 being exploited?
There is no known exploitation of CVE-2026-67643 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sql Server 2022
- CVE-2026-78456 SQL Server Remote Code Execution Vulnerability
- CVE-2025-47954 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-20803 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-66816 Microsoft SQL Server Security Feature Bypass Vulnerability
- CVE-2026-67389 Microsoft SQL Server Information Disclosure Vulnerability
Sources
Also known as GHSA-r6qg-cj8h-f89v.