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

Quick assessment

Affected
Microsoft Windows 11 Version 24H2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft HTTP.sys是美国Microsoft公司的一个HTTP协议栈组件，主要用于处理HTTP请求，其他功能还包括请求解析、缓存管理和内核级数据转发。 Microsoft HTTP.sys存在缓冲区错误漏洞，该漏洞源于越界读取，可能导致未经授权的攻击者在本地泄露信息。以下版本受到影响：Windows 11 Version 24H2 10.0.26100.8875之前版本、Windows 11 Version 25H2 10.0.26200.8875之前版本、Windows 11 Versi

CVSS 6.2 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 2 AI

T1122 T1530 · Data from Cloud Storage

Affected Version Matrix 5

VendorProduct Version RangeStatus
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.8875 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.8875 affected
Microsoft Windows 11 version 26H1 10.0.28000.0< 10.0.28000.2525 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.33158 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.33158 affected
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I. Basic Information for CVE-2026-50420

Vulnerability Information
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Vulnerability Title
HTTP.sys Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to disclose information locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft HTTP.sys 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft HTTP.sys是美国Microsoft公司的一个HTTP协议栈组件，主要用于处理HTTP请求，其他功能还包括请求解析、缓存管理和内核级数据转发。 Microsoft HTTP.sys存在缓冲区错误漏洞，该漏洞源于越界读取，可能导致未经授权的攻击者在本地泄露信息。以下版本受到影响：Windows 11 Version 24H2 10.0.26100.8875之前版本、Windows 11 Version 25H2 10.0.26200.8875之前版本、Windows 11 Versi
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.8875 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.8875 -
Microsoft Windows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.2525 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.33158 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.33158 -

II. Public POCs for CVE-2026-50420

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III. Intelligence Information for CVE-2026-50420

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Vendor Advisories for CVE-2026-50420 (1)

Same Patch Batch · Microsoft · 2026-07-14 · 570 CVEs total

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CVE-2026-48561 9.6 CRITICAL Microsoft Edge Copilot Remote Code Execution Vulnerability
CVE-2026-55008 9.6 CRITICAL Microsoft Exchange Server Spoofing Vulnerability
CVE-2026-50380 9.6 CRITICAL Windows GDI+ Remote Code Execution Vulnerability
CVE-2026-49798 9.3 CRITICAL Windows Kernel Elevation of Privilege Vulnerability
CVE-2026-55040 9.1 CRITICAL Microsoft SharePoint Server Security Feature Bypass Vulnerability

Showing top 20 of 570 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 11 Version 24H2
Same vendor: Microsoft
Same weakness: CWE-125

V. Comments for CVE-2026-50420

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