Use-after-free in Windows Server - CVE-2026-88119
Published: October 14, 2026
Vulnerability identifier: #VU155318
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-2026-88119
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to use-after-free in Windows DHCP Server when handling network packets. A remote attacker can send a specially crafted packet to the affected service to execute arbitrary code.
Successful exploitation requires winning a race condition. No user interaction is required.
Affected software
Windows Server
How to mitigate CVE-2026-88119
Install security update from vendor's website.
Windows Server - addressed in versions 2012 R2 6.3.9600.23470, 2012 6.2.9200.26434, 2016 10.0.14393.9612, 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650