Heap-based buffer overflow in Microsoft Windows and Windows Server - CVE-2026-102191
Published: October 13, 2026
Vulnerability identifier: #VU154249
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-2026-102191
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 to SYSTEM.
The vulnerability exists due to a heap-based buffer overflow in Windows Storage when exploited locally. A local user can exploit this flaw to escalate privileges to SYSTEM.
Successful exploitation requires a deep understanding of the system and depends on environmental factors, system configuration, and the presence of additional security measures. Successful exploitation is not guaranteed.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-102191
Install security update from vendor's website.
Microsoft Windows - addressed in versions 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 2022 10.0.20348.5761, 2025 10.0.26100.33650
Windows Server - addressed in versions 2022 10.0.20348.5761, 2025 10.0.26100.33650