Use-after-free in Windows Server - CVE-2026-96177
Published: November 11, 2026
Vulnerability identifier: #VU165770
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-2026-96177
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 on the affected server.
The vulnerability exists due to use-after-free in Windows DNS Server when handling network calls to endpoints. A remote attacker can call arbitrary endpoints from within the network and win a race condition to execute arbitrary code.
Affected software
Windows Server
How to mitigate CVE-2026-96177
Install security update from vendor's website.
Windows Server - addressed in versions 2025 10.0.26100.33730, 2025 10.0.26100.33822