Heap-based buffer overflow in Windows and Windows Server - CVE-2026-50668
Published: July 15, 2026
Vulnerability identifier: #VU137733
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-50668
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a local attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in Windows Resilient File System (ReFS). An attacker with physical access can insert a specially crafted USB device, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
How to mitigate CVE-2026-50668
Install updates from vendor's website.