Critical Windows HTTP.sys Vulnerability (CVE-2026-47291) Enables Unauthenticated Remote Code Execution

A critical vulnerability (CVSS 9.8) in Windows HTTP.sys enables unauthenticated remote code execution through an integer overflow. The flaw affects the HTTP protocol stack, which processes requests in kernel mode, allowing attackers to execute arbitrary code with system privileges. The post includes detailed technical analysis, such as assembly-level modifications, affected functions, and WinDbg reproduction steps. The source also tracks real-time structural breakdowns of Windows patches.