Heap-based buffer overflow in Microsoft SQL Server - CVE-2026-118106
Published: November 11, 2026
Vulnerability identifier: #VU165015
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-118106
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code in the affected SQL Server replication process.
The vulnerability exists due to a heap-based buffer overflow in SQL Server replication when processing data received over an existing replication connection. A remote attacker can supply specially crafted data from a replication peer under their control to execute arbitrary code in the affected replication process.
Exploitation requires the vulnerable replication feature and topology to be configured on the target instance; the vulnerability does not allow a participating database or replication peer to enable this server configuration.
Affected software
Microsoft SQL Server
How to mitigate CVE-2026-118106
Install security update from vendor's website.
Microsoft SQL Server - addressed in versions 14.0.2150.2, 14.0.3570.2, 15.0.2210.4, 15.0.4510.2, 16.0.1220.3, 16.0.4315.2, 17.0.1155.3, 17.0.5045.3