Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-125137
Published: November 11, 2026
Vulnerability identifier: #VU165508
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-2026-125137
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges, potentially gaining elevated privileges on the host system beyond the guest virtual machine boundary.
The vulnerability exists due to a heap-based buffer overflow in Windows Graphics Kernel when handling graphics operations in a virtual machine. A local user can trigger heap memory corruption locally to potentially gain elevated privileges on the host system.
Successful exploitation requires the affected virtual machine to have multiple assigned graphics adapters with differing configurations, a prerequisite outside the user's control.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-125137
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7846, 10 22H2 10.0.19045.7846, 10 1809 10.0.17763.9487, 11 23H2 10.0.22631.7711, 11 24H2 10.0.26100.9911, 11 24H2 10.0.26100.9974, 11 25H2 10.0.26200.9911, 11 25H2 10.0.26200.9974, 11 26H1 10.0.28000.3501
Windows Server - addressed in versions 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822
Windows Server - addressed in versions 2019 10.0.17763.9487, 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822