Out-of-bounds read in Microsoft Windows and Windows Server - CVE-2026-83501
Published: September 9, 2026
Vulnerability identifier: #VU148310
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-2026-83501
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose information.
The vulnerability exists due to an out-of-bounds read in the Windows Virtualization-Based Security (VBS) Enclave when processing local input. A local user can trigger the out-of-bounds read to disclose information.
Successful exploitation could allow VTL0 to view Virtual Trust Level 1 (VTL1) data.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-83501
Install security update from vendor's website.
Microsoft Windows - addressed in versions 11 23H2 10.0.22631.7582, 11 24H2 10.0.26100.9445, 11 25H2 10.0.26200.9445, 11 26H1 10.0.28000.2954
Windows Server - update to 2025 10.0.26100.33438
Windows Server - update to 2025 10.0.26100.33438