Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-105021
Published: November 10, 2026
Vulnerability identifier: #VU164620
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-2026-105021
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 an AppContainer and perform actions within the isolated security context of the affected graphics compilation service.
The vulnerability exists due to a heap-based buffer overflow in Windows Advanced Rasterization Platform when processing graphics data. A local user can run a malicious application locally inside an AppContainer and submit specially crafted graphics data to the isolated graphics compilation service to escalate privileges outside that AppContainer.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-105021
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