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.NET Framework Updates for April 2026 (#1305)
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‎.gitignore‎

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# Visual Studio debug profile
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**/launchSettings.json
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# C# DevKit language server cache
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*.lscache

‎README.aspnet.md‎

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Tags | Dockerfile | OS Version
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4.8.1-20251014-windowsservercore-ltsc2025, 4.8.1-windowsservercore-ltsc2025, 4.8.1 | [Dockerfile](src/aspnet/4.8.1/windowsservercore-ltsc2025/Dockerfile) | Windows Server Core 2025
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4.8.1-20251014-windowsservercore-ltsc2022, 4.8.1-windowsservercore-ltsc2022, 4.8.1 | [Dockerfile](src/aspnet/4.8.1/windowsservercore-ltsc2022/Dockerfile) | Windows Server Core 2022
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4.8-20251014-windowsservercore-ltsc2019, 4.8-windowsservercore-ltsc2019, 4.8, latest | [Dockerfile](src/aspnet/4.8/windowsservercore-ltsc2019/Dockerfile) | Windows Server Core 2019
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4.8-20251014-windowsservercore-ltsc2016, 4.8-windowsservercore-ltsc2016, 4.8, latest | [Dockerfile](src/aspnet/4.8/windowsservercore-ltsc2016/Dockerfile) | Windows Server Core 2016
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4.8.1-20260414-windowsservercore-ltsc2025, 4.8.1-windowsservercore-ltsc2025, 4.8.1 | [Dockerfile](src/aspnet/4.8.1/windowsservercore-ltsc2025/Dockerfile) | Windows Server Core 2025
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4.8.1-20260414-windowsservercore-ltsc2022, 4.8.1-windowsservercore-ltsc2022, 4.8.1 | [Dockerfile](src/aspnet/4.8.1/windowsservercore-ltsc2022/Dockerfile) | Windows Server Core 2022
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4.8-20260414-windowsservercore-ltsc2019, 4.8-windowsservercore-ltsc2019, 4.8, latest | [Dockerfile](src/aspnet/4.8/windowsservercore-ltsc2019/Dockerfile) | Windows Server Core 2019
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4.8-20260414-windowsservercore-ltsc2016, 4.8-windowsservercore-ltsc2016, 4.8, latest | [Dockerfile](src/aspnet/4.8/windowsservercore-ltsc2016/Dockerfile) | Windows Server Core 2016
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‎README.runtime.md‎

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Tags | Dockerfile | OS Version
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4.8.1-20251014-windowsservercore-ltsc2025, 4.8.1-windowsservercore-ltsc2025, 4.8.1 | [Dockerfile](src/runtime/4.8.1/windowsservercore-ltsc2025/Dockerfile) | Windows Server Core 2025
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4.8.1-20251014-windowsservercore-ltsc2022, 4.8.1-windowsservercore-ltsc2022, 4.8.1 | [Dockerfile](src/runtime/4.8.1/windowsservercore-ltsc2022/Dockerfile) | Windows Server Core 2022
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4.8-20251014-windowsservercore-ltsc2019, 4.8-windowsservercore-ltsc2019, 4.8, latest | [Dockerfile](src/runtime/4.8/windowsservercore-ltsc2019/Dockerfile) | Windows Server Core 2019
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4.8-20251014-windowsservercore-ltsc2016, 4.8-windowsservercore-ltsc2016, 4.8, latest | [Dockerfile](src/runtime/4.8/windowsservercore-ltsc2016/Dockerfile) | Windows Server Core 2016
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4.8.1-20260414-windowsservercore-ltsc2025, 4.8.1-windowsservercore-ltsc2025, 4.8.1 | [Dockerfile](src/runtime/4.8.1/windowsservercore-ltsc2025/Dockerfile) | Windows Server Core 2025
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4.8.1-20260414-windowsservercore-ltsc2022, 4.8.1-windowsservercore-ltsc2022, 4.8.1 | [Dockerfile](src/runtime/4.8.1/windowsservercore-ltsc2022/Dockerfile) | Windows Server Core 2022
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4.8-20260414-windowsservercore-ltsc2019, 4.8-windowsservercore-ltsc2019, 4.8, latest | [Dockerfile](src/runtime/4.8/windowsservercore-ltsc2019/Dockerfile) | Windows Server Core 2019
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4.8-20260414-windowsservercore-ltsc2016, 4.8-windowsservercore-ltsc2016, 4.8, latest | [Dockerfile](src/runtime/4.8/windowsservercore-ltsc2016/Dockerfile) | Windows Server Core 2016
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‎README.sdk.md‎

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4.8.1-20260310-windowsservercore-ltsc2025, 4.8.1-windowsservercore-ltsc2025, 4.8.1 | [Dockerfile](src/sdk/4.8.1/windowsservercore-ltsc2025/Dockerfile) | Windows Server Core 2025
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4.8.1-20260310-windowsservercore-ltsc2022, 4.8.1-windowsservercore-ltsc2022, 4.8.1 | [Dockerfile](src/sdk/4.8.1/windowsservercore-ltsc2022/Dockerfile) | Windows Server Core 2022
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4.8-20260310-windowsservercore-ltsc2019, 4.8-windowsservercore-ltsc2019, 4.8, latest | [Dockerfile](src/sdk/4.8/windowsservercore-ltsc2019/Dockerfile) | Windows Server Core 2019
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4.8-20260310-windowsservercore-ltsc2016, 4.8-windowsservercore-ltsc2016, 4.8, latest | [Dockerfile](src/sdk/4.8/windowsservercore-ltsc2016/Dockerfile) | Windows Server Core 2016
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4.8.1-20260414-windowsservercore-ltsc2025, 4.8.1-windowsservercore-ltsc2025, 4.8.1 | [Dockerfile](src/sdk/4.8.1/windowsservercore-ltsc2025/Dockerfile) | Windows Server Core 2025
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4.8.1-20260414-windowsservercore-ltsc2022, 4.8.1-windowsservercore-ltsc2022, 4.8.1 | [Dockerfile](src/sdk/4.8.1/windowsservercore-ltsc2022/Dockerfile) | Windows Server Core 2022
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4.8-20260414-windowsservercore-ltsc2019, 4.8-windowsservercore-ltsc2019, 4.8, latest | [Dockerfile](src/sdk/4.8/windowsservercore-ltsc2019/Dockerfile) | Windows Server Core 2019
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4.8-20260414-windowsservercore-ltsc2016, 4.8-windowsservercore-ltsc2016, 4.8, latest | [Dockerfile](src/sdk/4.8/windowsservercore-ltsc2016/Dockerfile) | Windows Server Core 2016
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‎README.wcf.md‎

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4.8.1-20251014-windowsservercore-ltsc2025, 4.8.1-windowsservercore-ltsc2025, 4.8.1 | [Dockerfile](src/wcf/4.8.1/windowsservercore-ltsc2025/Dockerfile) | Windows Server Core 2025
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4.8.1-20251014-windowsservercore-ltsc2022, 4.8.1-windowsservercore-ltsc2022, 4.8.1 | [Dockerfile](src/wcf/4.8.1/windowsservercore-ltsc2022/Dockerfile) | Windows Server Core 2022
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4.8-20251014-windowsservercore-ltsc2019, 4.8-windowsservercore-ltsc2019, 4.8, latest | [Dockerfile](src/wcf/4.8/windowsservercore-ltsc2019/Dockerfile) | Windows Server Core 2019
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4.8-20251014-windowsservercore-ltsc2016, 4.8-windowsservercore-ltsc2016, 4.8, latest | [Dockerfile](src/wcf/4.8/windowsservercore-ltsc2016/Dockerfile) | Windows Server Core 2016
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4.8.1-20260414-windowsservercore-ltsc2025, 4.8.1-windowsservercore-ltsc2025, 4.8.1 | [Dockerfile](src/wcf/4.8.1/windowsservercore-ltsc2025/Dockerfile) | Windows Server Core 2025
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4.8.1-20260414-windowsservercore-ltsc2022, 4.8.1-windowsservercore-ltsc2022, 4.8.1 | [Dockerfile](src/wcf/4.8.1/windowsservercore-ltsc2022/Dockerfile) | Windows Server Core 2022
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4.8-20260414-windowsservercore-ltsc2019, 4.8-windowsservercore-ltsc2019, 4.8, latest | [Dockerfile](src/wcf/4.8/windowsservercore-ltsc2019/Dockerfile) | Windows Server Core 2019
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4.8-20260414-windowsservercore-ltsc2016, 4.8-windowsservercore-ltsc2016, 4.8, latest | [Dockerfile](src/wcf/4.8/windowsservercore-ltsc2016/Dockerfile) | Windows Server Core 2016
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‎eng/update-dependencies/LcuVariableUpdater.cs‎

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var tableRowRegex = windowsVersion switch
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{
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"ltsc2022" => Server2022TableRowRegex,
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"ltsc2025" => Server2025TableRowRegex,
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_ => WindowsServerTableRowRegex
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};
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[GeneratedRegex(@"server.*21H2.*x64", RegexOptions.IgnoreCase, "en-US")]
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private static partial Regex Server2022TableRowRegex { get; }
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[GeneratedRegex(@"24H2.*x64", RegexOptions.IgnoreCase, "en-US")]
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private static partial Regex Server2025TableRowRegex { get; }
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}

‎manifest.datestamps.json‎

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{
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"variables": {
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"CurrentReleaseDateStamp": "20260310",
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"PreviousReleaseDateStamp": "20251014",
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"RuntimeReleaseDateStamp": "$(PreviousReleaseDateStamp)",
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"AspnetReleaseDateStamp": "$(PreviousReleaseDateStamp)",
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"WcfReleaseDateStamp": "$(PreviousReleaseDateStamp)",
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"CurrentReleaseDateStamp": "20260414",
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"RuntimeReleaseDateStamp": "$(CurrentReleaseDateStamp)",
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"AspnetReleaseDateStamp": "$(CurrentReleaseDateStamp)",
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"WcfReleaseDateStamp": "$(CurrentReleaseDateStamp)",
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"SdkReleaseDateStamp": "$(CurrentReleaseDateStamp)",
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"4.8-ltsc2016-Runtime-DateStamp": "$(RuntimeReleaseDateStamp)",

‎manifest.versions.json‎

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{
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"4.8-is-security-release": true,
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"kb|ltsc2016|4.8": "KB5066136",
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"lcu|ltsc2016|4.8": "https://catalog.s.download.windowsupdate.com/c/msdownload/update/software/secu/2025/09/windows10.0-kb5066136-x64-ndp48_33a9703bab6ff8534a1cc8a590d85b179a24718d.msu",
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"kb|ltsc2019|4.8": "KB5066137",
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"lcu|ltsc2019|4.8": "https://catalog.s.download.windowsupdate.com/d/msdownload/update/software/secu/2025/09/windows10.0-kb5066137-x64-ndp48_76f67956da4f912c51e0aba2b09e3175709974a4.msu",
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"kb|ltsc2022|4.8.1": "KB5066134",
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"lcu|ltsc2022|4.8.1": "https://catalog.s.download.windowsupdate.com/c/msdownload/update/software/secu/2025/09/windows10.0-kb5066134-x64-ndp481_103b0d4cef1c6b42632f1cb043725ded0fce0ed3.msu",
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"kb|ltsc2025|4.8.1": "KB5066131",
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"lcu|ltsc2025|4.8.1": "https://catalog.sf.dl.delivery.mp.microsoft.com/filestreamingservice/files/035cd7e9-5769-4168-80e4-d73bc6b746c8/public/windows11.0-kb5066131-x64-ndp481_b2ab1290d276d5cb9c9d03dce5ad2d6e2b66f615.msu",
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"kb|ltsc2016|4.8": "KB5082411",
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"lcu|ltsc2016|4.8": "https://catalog.s.download.windowsupdate.com/d/msdownload/update/software/secu/2026/03/windows10.0-kb5082411-x64-ndp48_21d9288b9b7c21c1557609b58e6926bcb3ca05b2.msu",
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"kb|ltsc2019|4.8": "KB5082414",
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"lcu|ltsc2019|4.8": "https://catalog.s.download.windowsupdate.com/d/msdownload/update/software/secu/2026/03/windows10.0-kb5082414-x64-ndp48_6edea76ef38203f73b3af222041187375a209d65.msu",
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"kb|ltsc2022|4.8.1": "KB5082425",
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"lcu|ltsc2022|4.8.1": "https://catalog.s.download.windowsupdate.com/d/msdownload/update/software/secu/2026/03/windows10.0-kb5082425-x64-ndp481_435f53976e85e367d28583d5e767ad3263e52bf0.msu",
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"kb|ltsc2025|4.8.1": "KB5082420",
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"lcu|ltsc2025|4.8.1": "https://catalog.sf.dl.delivery.mp.microsoft.com/filestreamingservice/files/9e7e9e65-f8e1-4c58-895a-03a4e4b27b16/public/windows11.0-kb5082420-x64-ndp481_e669d8241160acba1ade1a111a50a5702f15706e.msu",
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"nuget|version": "7.3.0",
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"referenceassemblies|version": "1.0.3",
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"servicemonitor|version": "2.0.1.10",

‎src/aspnet/4.8.1/windowsservercore-ltsc2022/Dockerfile‎

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# escape=`
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ARG REPO=mcr.microsoft.com/dotnet/framework/runtime
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FROM $REPO:4.8.1-20251014-windowsservercore-ltsc2022
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FROM $REPO:4.8.1-20260414-windowsservercore-ltsc2022
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RUN dism /Online /Quiet /Enable-Feature /All /FeatureName:IIS-WebServerRole /FeatureName:NetFx4Extended-ASPNET45 /FeatureName:IIS-ASPNET45 `
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&& dism /Online /Quiet /Disable-Feature /FeatureName:IIS-WebServerManagementTools `

‎src/aspnet/4.8.1/windowsservercore-ltsc2025/Dockerfile‎

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# escape=`
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ARG REPO=mcr.microsoft.com/dotnet/framework/runtime
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FROM $REPO:4.8.1-20251014-windowsservercore-ltsc2025
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FROM $REPO:4.8.1-20260414-windowsservercore-ltsc2025
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RUN dism /Online /Quiet /Enable-Feature /All /FeatureName:IIS-WebServerRole /FeatureName:NetFx4Extended-ASPNET45 /FeatureName:IIS-ASPNET45 `
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&& dism /Online /Quiet /Disable-Feature /FeatureName:IIS-WebServerManagementTools `

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