Out-of-bounds read in Microsoft Windows and Windows Server - CVE-2026-118278
Published: November 11, 2026
Vulnerability identifier: #VU165080
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-2026-118278
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges beyond their own AppContainer into the isolated graphics compilation service's security context.
The vulnerability exists due to an out-of-bounds read in Windows Advanced Rasterization Platform when processing graphics data submitted to the isolated graphics compilation service. A local user can run a malicious application locally inside an AppContainer and submit specially crafted graphics data to perform actions within the service's isolated security context.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-118278
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7807, 10 22H2 10.0.19045.7807, 10 1809 10.0.17763.9376, 11 23H2 10.0.22631.7652, 11 24H2 10.0.26100.9711, 11 25H2 10.0.26200.9711, 11 26H1 10.0.28000.3231
Windows Server - addressed in versions 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650
Windows Server - addressed in versions 2019 10.0.17763.9376, 2022 10.0.20348.5761, 2025 10.0.26100.33650