CVE-2026-50485: Windows Hyper-V Denial of Service Vulnerability

Overview

Severity
Medium (CVSS 4.5)
CVSS Vector
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Category
Denial of Service
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2026-Jul
Released
2026-07-14
EPSS Score
0.37% (percentile: 29.1%)

Description

Buffer over-read in Windows Hyper-V allows an authorized attacker to deny service over an adjacent network.

Affected Products (27)

Windows

  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2022
  • Windows 10 Version 21H2 for 32-bit Systems
  • Windows 10 Version 21H2 for ARM64-based Systems
  • Windows 10 Version 21H2 for x64-based Systems
  • Windows Server 2025 (Server Core installation)
  • Windows 11 Version 25H2 for ARM64-based Systems
  • Windows 11 Version 25H2 for x64-based Systems
  • Windows 11 Version 24H2 for ARM64-based Systems
  • Windows 11 Version 24H2 for x64-based Systems
  • Windows Server 2025
  • Windows 10 Version 1607 for 32-bit Systems
  • Windows 10 Version 1607 for x64-based Systems
  • Windows Server 2016
  • Windows Server 2016 (Server Core installation)
  • Windows 11 Version 26H1 for ARM64-based Systems
  • Windows 11 version 26H1 for x64-based Systems

ESU

  • Windows 10 Version 22H2 for x64-based Systems
  • Windows 10 Version 22H2 for ARM64-based Systems
  • Windows 10 Version 22H2 for 32-bit Systems
  • Windows Server 2012
  • Windows Server 2012 (Server Core installation)
  • Windows Server 2012 R2
  • Windows Server 2012 R2 (Server Core installation)

Security Updates (9)

Acknowledgments

Anonymous, Anonymous, <a href="https://x.com/physicube">Jungwoo Lee</a> with <a href="https://softsec.kaist.ac.kr/">KAIST SoftSec Lab</a>, <a href="https://x.com/_qwerty_po">Wongi Lee</a> with <a href="https://xint.io/">Theori</a>, Linzishan &amp; Anemone &amp; Zhiniang Peng (HUST), sweetchip, Daejin Lee

Revision History

  • 2026-07-14: Information published.