CVE-2026-105733: Windows Hyper-V Remote Code Execution Vulnerability

Overview

Severity
High (CVSS 8.8)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
Category
Remote Code Execution
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2026-Oct
Released
2026-10-13

Description

Improper access control in Windows Hyper-V allows an authorized attacker to execute code locally.

FAQ

How could an attacker exploit this vulnerability? To exploit this vulnerability, an attacker could run a specially crafted application on a Hyper-V guest that could cause the Hyper-V host operating system to execute arbitrary code. According to the CVSS metric, successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? An attacker on a nested guest VM who successfully exploited the vulnerability could escape their VM and gain admin privilege on the guest that is serving as the host. For diagrams and more detailed information about nested VMs please see Run Hyper-V in a Virtual Machine with Nested Virtualization.

Affected Products (20)

Windows

  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for x64-based Systems
  • Windows Server 2022
  • Windows Server 2022 (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 26H2 for x64-based Systems
  • Windows Server 2025
  • Windows Server 2025 (Server Core installation)
  • Windows 11 version 26H1 for x64-based Systems
  • Windows 11 Version 23H2 for ARM64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows 11 Version 26H2 for ARM64-based Systems
  • Windows 11 Version 26H1 for ARM64-based Systems
  • Windows 10 Version 21H2 for 32-bit Systems

ESU

  • Windows 10 Version 22H2 for ARM64-based Systems
  • Windows 10 Version 22H2 for x64-based Systems
  • Windows 10 Version 22H2 for 32-bit Systems

Security Updates (6)

Acknowledgments

namnp with <a href="https://x.com/vcslab">Viettel Cyber Security</a>

Revision History

  • 2026-10-13: Information published.