Integer underflow in Microsoft Windows and Windows Server - CVE-2026-122162
Published: November 11, 2026
Vulnerability identifier: #VU165445
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-122162
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information from heap memory.
The vulnerability exists due to an integer underflow in Windows Update Stack when an arithmetic result falls below the representable range. A local user can trigger an out-of-bounds read to disclose small portions of heap memory.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-122162
Install security update from vendor's website.
Microsoft Windows - addressed in versions 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 2025 10.0.26100.33730, 2025 10.0.26100.33822
Windows Server - addressed in versions 2025 10.0.26100.33730, 2025 10.0.26100.33822