CVE-2026-88111: Microsoft SQL Server heap buffer overflow

CVE-2026-88111 · Severity: high · CVSS 7.5 · Published 2026-11-10

A heap buffer overflow vulnerability in SQL Server allows an authenticated attacker with network access to execute arbitrary code on the affected system. An attacker who exploits this could gain full control of the database server and access all data stored within it, posing a critical risk to organizations relying on SQL Server for their data management.

Technologies: Microsoft SQL Server. Vendors: Microsoft.

Quick answers

Is CVE-2026-88111 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-88111 being exploited in the wild.
How severe is CVE-2026-88111?
High severity, with a CVSS score of 7.5, published 10 November 2026.
Which products and versions are affected?
Microsoft SQL Server.
Is there a fix for CVE-2026-88111?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-88111 attacked?
It is attacked over the network.
Am I affected by CVE-2026-88111?
Check whether you run Microsoft SQL Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based buffer overflow in SQL Server allows an authenticated network attacker to execute arbitrary code with the privileges of the SQL Server process. The vulnerability requires valid database credentials and network connectivity to the SQL Server instance. Successful exploitation results in remote code execution on the affected server.

Affected products

  • Microsoft SQL Server

Timeline

  • 2026-11-10: disclosed

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.