Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-119916
Published: November 11, 2026
Vulnerability identifier: #VU165339
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-119916
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escape the application sandbox and escalate privileges on the affected system.
The vulnerability exists due to a heap-based buffer overflow in Windows Input System when handling operations initiated from a low-privilege AppContainer. A local user can execute code within that container to exploit the overflow and escape the sandbox to gain elevated privileges.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-119916
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