Heap-based buffer overflow in Microsoft SQL Server - CVE-2026-67646
Published: November 11, 2026
Vulnerability identifier: #VU165518
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-67646
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 an affected Microsoft SQL Server.
The vulnerability exists due to a heap-based buffer overflow in Microsoft SQL Server when processing specially crafted queries or requests. A remote user can submit a specially crafted query or request over a network to trigger memory corruption and execute arbitrary code on the server.
Affected software
Microsoft SQL Server
How to mitigate CVE-2026-67646
Install security update from vendor's website.
Microsoft SQL Server - addressed in versions 17.0.1155.3, 17.0.5045.3