KB5068865: fixes an issue in the HTTP.sys request parser, a Windows component that reads and processes HTTP requests

November 11, 2025—KB5068865 (OS Build 22631.6199)

Highlights
This update addresses security issues for your Windows operating system. ​​​​​​​

​​​​​​​Improvements​​​​​​​
This security update contains fixes and quality improvements from KB5068865 (released October 28, 2025). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.

• [Networking] Fixed: This update fixes an issue in the HTTP.sys request parser, a Windows component that reads and processes HTTP requests. The parser allowed a single line break within HTTP/1.1 chunk extensions, where the RFC 9112 standard requires a carriage return and line feed (CRLF) sequence to terminate each chunk. This can cause a parsing discrepancy when front end proxies are a part of the setup.

To turn on strict parsing, use the following registry key:

Registry Key: [HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Http\\Parameters]

Registry value: "HttpAllowLenientChunkExtParsing"=dword:00000000

Data to be set: 0

If you've already installed previous updates, your device will download and install only the new updates included in this package.