CVE-2026-77486 Microsoft SQL Server Remote Code Execution Vulnerability

High 8.8 Published 8 Sep 2026 Updated 14 Oct 2026

An integer overflow in Microsoft SQL Server allows unauthorized attackers to execute arbitrary code over the network.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-77486?

CVE-2026-77486 is a high-severity vulnerability in Microsoft Sql Server 2017, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Integer overflow or wraparound in SQL Server allows an unauthorized attacker to execute code over a network.

Weakness: CWE-190, CWE-122

Which versions are affected by CVE-2026-77486?

It affects 2 products.

Products include Microsoft Sql Server 2017, Microsoft Sql Server 2019.

How do I fix CVE-2026-77486?

No fix has been published for CVE-2026-77486 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-77486 being exploited?

There is no known exploitation of CVE-2026-77486 in the wild and no public exploit code.

All Microsoft Sql Server 2017 vulnerabilities

Sources

Also known as GHSA-p7q9-j6xv-6q58.