CVE-2026-50420: HTTP.sys Information Disclosure Vulnerability

Overview

Severity

Medium (CVSS 6.2)

CVSS Vector

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

Category

Information Disclosure

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jul

Released

2026-07-14

Description

Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to disclose information 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 (4)

• 5099536
• 5101650
• 5095051
• 5101649

Acknowledgments

<a href="https://x.com/gr4ss341">grass341</a> with <a href="https://viettelsecurity.com/">Viettel Cyber Security</a>

Revision History

• 2026-07-14: Information published.