Deserialization of Untrusted Data in Microsoft SQL Server - CVE-2026-54117
Published: July 17, 2026
Vulnerability identifier: #VU138256
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-2026-54117
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data in Microsoft SQL Server. A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Microsoft SQL Server
How to mitigate CVE-2026-54117
Install updates from vendor's website.
Microsoft SQL Server - addressed in versions 2025 GDR 17.0.1125.2, 2025 CU6 + GDR 17.0.4060.2