Type Confusion in Windows and Windows Server - CVE-2026-45641
Published: June 9, 2026
Vulnerability identifier: #VU134022
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-45641
CWE-ID: CWE-843
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a type confusion error in Windows Hyper-V. A remote attacker can pass specially crafted data to the application, trigger a type confusion error and execute arbitrary code on the target system.
How to mitigate CVE-2026-45641
Install updates from vendor's website.