CVE-2026-77488 Microsoft SQL Server Information Disclosure Vulnerability

Medium 5.5 Published 8 Sep 2026 Updated 14 Oct 2026

An authorized local attacker can exploit an integer underflow in Microsoft SQL Server to disclose sensitive information.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-77488?

CVE-2026-77488 is a medium-severity vulnerability in Microsoft Sql Server 2017, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Integer underflow (wrap or wraparound) in SQL Server allows an authorized attacker to disclose information locally.

Weakness: CWE-191

Which versions are affected by CVE-2026-77488?

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-2026-77488?

No fix has been published for CVE-2026-77488 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-77488 being exploited?

There is no known exploitation of CVE-2026-77488 in the wild and no public exploit code.

All Microsoft Sql Server 2017 vulnerabilities

Sources

Also known as GHSA-2p2q-6jp7-fc7g.