Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-118280
Published: November 11, 2026
Vulnerability identifier: #VU165082
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-2026-118280
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 beyond their AppContainer and perform actions within the isolated graphics compilation service's security context.
The vulnerability exists due to a heap-based buffer overflow in Windows Advanced Rasterization Platform when processing data in memory. A local user can use complex memory shaping techniques to trigger heap memory corruption and escalate privileges.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-118280
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