CVE-2026-67636 Microsoft SQL Server Remote Code Execution Vulnerability

Critical 9.0 Published 8 Sep 2026 Updated 14 Oct 2026

An out-of-bounds read in Microsoft SQL Server allows unauthorized attackers to execute code over the network.

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-2026-67636?

CVE-2026-67636 is a critical memory corruption vulnerability in Microsoft Sql Server 2019, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Out-of-bounds read in SQL Server allows an unauthorized attacker to execute code over a network.

Weakness: CWE-125

Which versions are affected by CVE-2026-67636?

It affects 3 products.

Products include Microsoft Sql Server 2019, Microsoft Sql Server 2022, Microsoft Sql Server 2025.

How do I fix CVE-2026-67636?

No fix has been published for CVE-2026-67636 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-2026-67636 being exploited?

There is no known exploitation of CVE-2026-67636 in the wild and no public exploit code.

All Microsoft Sql Server 2019 vulnerabilities

Sources

Also known as GHSA-9r6v-wqq6-8v3r.