Double free in Windows Server - CVE-2026-119957
Published: November 11, 2026
Vulnerability identifier: #VU165376
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-119957
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges from a guest virtual machine to those of the affected virtualization service on the host.
The vulnerability exists due to a double free in Windows Remote Desktop Services when managing memory. A local user can exploit the resulting memory corruption from within a guest virtual machine to gain the privileges of the affected virtualization service on the host.
Successful exploitation requires winning a race condition.
Affected software
Windows Server
How to mitigate CVE-2026-119957
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