Out-of-bounds read in Windows Server - CVE-2026-88243
Published: November 11, 2026
Vulnerability identifier: #VU165580
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-88243
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the affected server.
The vulnerability exists due to an out-of-bounds read in Windows DHCP Server when handling network requests. A remote attacker can call arbitrary endpoints over the network to execute arbitrary code on the affected server.
Affected software
Windows Server
How to mitigate CVE-2026-88243
Install security update from vendor's website.
Windows Server - addressed in versions 2016 10.0.14393.9688, 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822