Time-of-check Time-of-use (TOCTOU) Race Condition in Windows Server - CVE-2026-88216
Published: November 11, 2026
Vulnerability identifier: #VU165557
CSH Severity: Low
CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-88216
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code on the affected server.
The vulnerability exists due to a time-of-check time-of-use (TOCTOU) race condition in Windows DHCP Server when handling network requests. A remote user can win a race between checking a resource and using it to execute arbitrary code on the affected server.
Affected software
Windows Server
How to mitigate CVE-2026-88216
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