Heap-based buffer overflow in Microsoft SQL Server - CVE-2026-88111
Published: November 11, 2026
Vulnerability identifier: #VU165550
CSH Severity: Low
CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-88111
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code on the SQL Server system.
The vulnerability exists due to a heap-based buffer overflow in Microsoft SQL Server when processing input received over a network. A remote user can supply specially crafted input to corrupt heap memory and execute arbitrary code.
Affected software
Microsoft SQL Server
How to mitigate CVE-2026-88111
Install security update from vendor's website.
Microsoft SQL Server - addressed in versions 16.0.4315.2, 17.0.5045.3