CVE-2026-50501: Windows Resilient File System (ReFS) Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 7.8)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2026-Jul

Released

2026-07-14

Description

Stack-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker to execute code locally.

Affected Products (8)

Windows

• 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 11 version 26H1 for x64-based Systems
• Windows 11 Version 26H1 for ARM64-based Systems

Security Updates (3)

• 5099536
• 5101650
• 5101649

Acknowledgments

<a href="https://x.com/_patchpoint_">Donghyeon Oh</a> with <a href="https://patchpoint.io/">Patchpoint</a>, Jonghoi Kim, Thanatos Tian &amp; wgg &amp; @2st__ with Diffract, pwn2addr, <a href="https://x.com/m4x_1997">Aobo Wang</a>

Revision History

• 2026-07-14: Information published.