Out-of-bounds write in Microsoft Windows and Windows Server - CVE-2026-42910
Published: June 12, 2026
Vulnerability identifier: #VU134466
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-2026-42910
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input in Windows Hotpatch Monitoring Service. A local user can trigger an out-of-bounds write and gain elevated privileges on the target system.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-42910
Install updates from vendor's website.
Microsoft Windows - addressed in versions 10 1607 10.0.14393.9234, 11 24H2 10.0.26100.8655, 11 25H2 10.0.26200.8655, 11 26H1 10.0.28000.2269
Windows Server - addressed in versions 2004 10.0.19045.7417, 2025 10.0.26100.32995
Windows Server - addressed in versions 2004 10.0.19045.7417, 2025 10.0.26100.32995