Microsoftは11月11日(現地時間)、毎月米国時間の第2火曜日に提供している月例更新の一環として、Windows 11 Version 25H2/24H2用の累積アップデートKB5068861を23H2用の累積アップデートKB5068865をリリースしました。更新プログラムは主にシステムの品質を改善し、セキュリティ問題を修正するものです。自動的にインストールされますが、Windows UpdateまたはMicrosoft Update Catalogを利用して手動でインストールすることもできます。それぞれの変更点は以下の通りです(キュリティアップデートの内容は日本Microsoftのブログで参照できます)。November 11, 2025—KB5068861 (OS Builds 26200.7171 and 26100.7171)Windows 11 Version 25H2/24H2用の更新プログラムKB5068861では、10月28日に公開されたKB5067036の内容に加え、一部の携帯型ゲーム機で発生していたゲーム関連の問題の修正や、Storage SpacesやStorage Spaces Direct のクラスタ作成時に失敗する問題の修正、タスクマネージャーを閉じてもバックグラウンドでプロセスが残る問題の修正などが行われています。リリースノートは以下の通りです。ハイライトThis update addresses security issues for your Windows operating system. 改良と修正[Gaming]Fixed: This update addresses an issue that affects gaming handheld devices. These devices were unable to stay in low-power states, which caused faster battery drain.Fixed: This update addresses an issue on some handheld gaming devices where after signing in using the built-in Gamepad, the controller might not respond in apps for about five seconds, causing a delay. After you submit your password or PIN, the touch keyboard on the sign-in screen hides automatically.[Storage] Fixed: This update addresses an issue that could cause some Storage Spaces to become inaccessible or Storage Spaces Direct to fail when creating a storage cluster.[System utilities (known issue)] Fixed: This update addresses an issue where closing Task Manager with the Close button didn’t fully end the process, leaving background instances that could slow performance over time. This might occur after installing KB5067036.[Voice Access] Fixed: This update addresses an issue where Voice Access failed during initial setup if no microphone was connected and the voice model wasn’t installed.[Window management] Fixed: This update addresses an issue where selecting the desktop could unexpectedly open Task View.[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 off strict parsing, use the following registry key:Registry Key:[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Http\Parameters] Registry value: "HttpAllowLenientChunkExtParsing"=dword:00000001 Data to be set: 1既知の不具合更新プログラムには既知の不具合は存在しません。更新プログラムはWindows Updateの他、Microsoft Update Catalog、Windows Server Update Services(WSUS)を利用してインストールすることができます。November 11, 2025—KB5068865 (OS Build 22631.6199)Windows 11 Version 23H2用の更新プログラムKB5068865では、10月28日に公開されたKB5068865の内容に加え、HTTP.sysリクエストパーサーの問題が修正されています。リリースノートは以下の通りです。ハイライトThis update addresses security issues for your Windows operating system. 改良と修正Normal rolloutImportant: Use EKB KB5027397 to update to Windows 11, version 23H2.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.For more information about security vulnerabilities, see the Security Update Guide and the November 2025 Security Update.既知の不具合更新プログラムには既知の不具合は存在しません。更新プログラムはWindows Updateの他、Microsoft Update Catalog、Windows Server Update Services(WSUS)を利用してインストールすることができます。