diff --git a/NuGet.config b/NuGet.config
index 671ab38936c684..5b89305119684c 100644
--- a/NuGet.config
+++ b/NuGet.config
@@ -27,6 +27,7 @@
     <add key="dotnet11" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet11/nuget/v3/index.json" />
     <add key="dotnet11-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet11-transport/nuget/v3/index.json" />
     <add key="dotnet-diagnostics-tests" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-diagnostics-tests/nuget/v3/index.json" />
+    <add key="general-testing" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/general-testing/nuget/v3/index.json" />
   </packageSources>
   <disabledPackageSources>
     <clear />
diff --git a/eng/AcquireEmscriptenSdk.targets b/eng/AcquireEmscriptenSdk.targets
index e0563d98ac3122..a30475d5fbc4bd 100644
--- a/eng/AcquireEmscriptenSdk.targets
+++ b/eng/AcquireEmscriptenSdk.targets
@@ -235,4 +235,27 @@ JS_ENGINES = [NODE_JS]
   <Target Name="AcquireEmscriptenSdk"
           Condition="'$(TargetsBrowser)' == 'true' or $(MonoGenerateOffsetsOSGroups.Contains('browser'))"
           DependsOnTargets="AcquireEmscriptenSdkUnconditional" />
+
+  <!-- Validation only. Fails the build when the provisioned Node or npm is not the expected version, which
+       also catches a stale shared cache entry that still holds the previous Node. The Mono AOT cross compiler
+       build invokes mono.proj for browser-wasm without restoring the Emscripten packs, so it provisions no
+       Node and is not checked. -->
+  <Target Name="_ValidateNode423Toolchain"
+          AfterTargets="AcquireEmscriptenSdkUnconditional"
+          Condition="'$(EMSDK_PATH)' != '' and '$(TargetsBrowser)' == 'true' and '$(BuildMonoAOTCrossCompilerOnly)' != 'true'">
+    <PropertyGroup>
+      <_NodeValidationRoot>$([MSBuild]::EnsureTrailingSlash('$(EMSDK_PATH)'))node/</_NodeValidationRoot>
+      <_NodeValidationExe>$(_NodeValidationRoot)bin/node</_NodeValidationExe>
+      <_NodeValidationExe Condition="'$(HostOS)' == 'windows'">$(_NodeValidationRoot)bin/node.exe</_NodeValidationExe>
+      <_NodeValidationNpmCli>$(_NodeValidationRoot)lib/node_modules/npm/bin/npm-cli.js</_NodeValidationNpmCli>
+      <_NodeValidationNpmCli Condition="'$(HostOS)' == 'windows'">$(_NodeValidationRoot)bin/node_modules/npm/bin/npm-cli.js</_NodeValidationNpmCli>
+    </PropertyGroup>
+    <Message Text="Validating Node transport $(NodePackageVersion) for dotnet/node#423 at $(_NodeValidationExe)" Importance="High" />
+    <Exec Command="&quot;$(_NodeValidationExe)&quot; -e &quot;const assert = require('node:assert/strict'); assert.equal(process.versions.node, '24.22.1'); assert.equal(process.versions.undici, '7.30.1'); console.log(process.execPath, process.version, 'undici', process.versions.undici)&quot;" />
+    <Exec Command="&quot;$(_NodeValidationExe)&quot; &quot;$(_NodeValidationNpmCli)&quot; --version"
+          ConsoleToMSBuild="true">
+      <Output TaskParameter="ConsoleOutput" PropertyName="_ValidatedNpmVersion" />
+    </Exec>
+    <Error Condition="'$(_ValidatedNpmVersion)' != '11.19.1'" Text="Expected npm 11.19.1, got '$(_ValidatedNpmVersion)'." />
+  </Target>
 </Project>
diff --git a/eng/Version.Details.props b/eng/Version.Details.props
index c0c900590e8d2c..2963247767d7b4 100644
--- a/eng/Version.Details.props
+++ b/eng/Version.Details.props
@@ -36,7 +36,7 @@ This file should be imported by eng/Versions.props
     <MicrosoftNetCompilersToolsetPackageVersion>5.12.0-1.26521.105</MicrosoftNetCompilersToolsetPackageVersion>
     <MicrosoftNETRuntimeEmscriptenInternalPackageVersion>11.0.0</MicrosoftNETRuntimeEmscriptenInternalPackageVersion>
     <MicrosoftNETSdkILPackageVersion>11.0.0</MicrosoftNETSdkILPackageVersion>
-    <MicrosoftNETWorkloadEmscriptenCurrentManifest110100TransportPackageVersion>11.0.100-rtm.26521.105</MicrosoftNETWorkloadEmscriptenCurrentManifest110100TransportPackageVersion>
+    <MicrosoftNETWorkloadEmscriptenCurrentManifest110100TransportPackageVersion>11.0.100-rtm.26523.122</MicrosoftNETWorkloadEmscriptenCurrentManifest110100TransportPackageVersion>
     <MicrosoftNETCoreAppRefPackageVersion>11.0.0</MicrosoftNETCoreAppRefPackageVersion>
     <MicrosoftNETCoreILAsmPackageVersion>11.0.0</MicrosoftNETCoreILAsmPackageVersion>
     <NuGetFrameworksPackageVersion>8.0.0-rc.52305</NuGetFrameworksPackageVersion>
@@ -83,14 +83,14 @@ This file should be imported by eng/Versions.props
     <runtimewinx64MicrosoftNETCoreRuntimeMonoLLVMSdkPackageVersion>23.1.0-alpha.1.26505.4</runtimewinx64MicrosoftNETCoreRuntimeMonoLLVMSdkPackageVersion>
     <runtimewinx64MicrosoftNETCoreRuntimeMonoLLVMToolsPackageVersion>23.1.0-alpha.1.26505.4</runtimewinx64MicrosoftNETCoreRuntimeMonoLLVMToolsPackageVersion>
     <!-- dotnet-node dependencies -->
-    <runtimelinuxarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26517.3</runtimelinuxarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
-    <runtimelinuxmuslarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26517.3</runtimelinuxmuslarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
-    <runtimelinuxmuslx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26517.3</runtimelinuxmuslx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
-    <runtimelinuxx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26517.3</runtimelinuxx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
-    <runtimeosxarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26517.3</runtimeosxarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
-    <runtimeosxx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26517.3</runtimeosxx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
-    <runtimewinarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26517.3</runtimewinarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
-    <runtimewinx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26517.3</runtimewinx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
+    <runtimelinuxarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26523.2</runtimelinuxarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
+    <runtimelinuxmuslarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26523.2</runtimelinuxmuslarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
+    <runtimelinuxmuslx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26523.2</runtimelinuxmuslx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
+    <runtimelinuxx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26523.2</runtimelinuxx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
+    <runtimeosxarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26523.2</runtimeosxarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
+    <runtimeosxx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26523.2</runtimeosxx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
+    <runtimewinarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26523.2</runtimewinarm64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
+    <runtimewinx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>11.0.0-alpha.1.26523.2</runtimewinx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion>
     <!-- dotnet-optimization dependencies -->
     <optimizationlinuxarm64MIBCRuntimePackageVersion>1.0.0-prerelease.26502.1</optimizationlinuxarm64MIBCRuntimePackageVersion>
     <optimizationlinuxx64MIBCRuntimePackageVersion>1.0.0-prerelease.26502.1</optimizationlinuxx64MIBCRuntimePackageVersion>
diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
index 20b51a488ec4a4..ad1d6b1453dd6e 100644
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@@ -45,9 +45,9 @@
       <Uri>https://github.com/dotnet/dotnet</Uri>
       <Sha>6fa58a2ef810f82b3197d69763cedfb34c88b9fd</Sha>
     </Dependency>
-    <Dependency Name="Microsoft.NET.Workload.Emscripten.Current.Manifest-11.0.100.Transport" Version="11.0.100-rtm.26521.105">
+    <Dependency Name="Microsoft.NET.Workload.Emscripten.Current.Manifest-11.0.100.Transport" Version="11.0.100-rtm.26523.122">
       <Uri>https://github.com/dotnet/dotnet</Uri>
-      <Sha>6fa58a2ef810f82b3197d69763cedfb34c88b9fd</Sha>
+      <Sha>2b5a4387dbee6181159f53c9ab1ada19a5ebe720</Sha>
     </Dependency>
     <Dependency Name="Microsoft.NET.Runtime.Emscripten.Internal" Version="11.0.0">
       <Uri>https://github.com/dotnet/dotnet</Uri>
@@ -385,37 +385,37 @@
       <Uri>https://github.com/dotnet/dotnet</Uri>
       <Sha>6fa58a2ef810f82b3197d69763cedfb34c88b9fd</Sha>
     </Dependency>
-    <Dependency Name="runtime.linux-arm64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26517.3">
-      <Uri>https://github.com/dotnet/node</Uri>
-      <Sha>1ab9161aaf6814d105d3aa78c752bfd222e0946e</Sha>
+    <Dependency Name="runtime.linux-arm64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26523.2">
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-node</Uri>
+      <Sha>8c288428de44adaab8f60963302d0ab511eb5887</Sha>
     </Dependency>
-    <Dependency Name="runtime.linux-musl-arm64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26517.3">
-      <Uri>https://github.com/dotnet/node</Uri>
-      <Sha>1ab9161aaf6814d105d3aa78c752bfd222e0946e</Sha>
+    <Dependency Name="runtime.linux-musl-arm64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26523.2">
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-node</Uri>
+      <Sha>8c288428de44adaab8f60963302d0ab511eb5887</Sha>
     </Dependency>
-    <Dependency Name="runtime.linux-x64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26517.3">
-      <Uri>https://github.com/dotnet/node</Uri>
-      <Sha>1ab9161aaf6814d105d3aa78c752bfd222e0946e</Sha>
+    <Dependency Name="runtime.linux-x64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26523.2">
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-node</Uri>
+      <Sha>8c288428de44adaab8f60963302d0ab511eb5887</Sha>
     </Dependency>
-    <Dependency Name="runtime.linux-musl-x64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26517.3">
-      <Uri>https://github.com/dotnet/node</Uri>
-      <Sha>1ab9161aaf6814d105d3aa78c752bfd222e0946e</Sha>
+    <Dependency Name="runtime.linux-musl-x64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26523.2">
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-node</Uri>
+      <Sha>8c288428de44adaab8f60963302d0ab511eb5887</Sha>
     </Dependency>
-    <Dependency Name="runtime.osx-arm64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26517.3">
-      <Uri>https://github.com/dotnet/node</Uri>
-      <Sha>1ab9161aaf6814d105d3aa78c752bfd222e0946e</Sha>
+    <Dependency Name="runtime.osx-arm64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26523.2">
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-node</Uri>
+      <Sha>8c288428de44adaab8f60963302d0ab511eb5887</Sha>
     </Dependency>
-    <Dependency Name="runtime.osx-x64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26517.3">
-      <Uri>https://github.com/dotnet/node</Uri>
-      <Sha>1ab9161aaf6814d105d3aa78c752bfd222e0946e</Sha>
+    <Dependency Name="runtime.osx-x64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26523.2">
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-node</Uri>
+      <Sha>8c288428de44adaab8f60963302d0ab511eb5887</Sha>
     </Dependency>
-    <Dependency Name="runtime.win-arm64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26517.3">
-      <Uri>https://github.com/dotnet/node</Uri>
-      <Sha>1ab9161aaf6814d105d3aa78c752bfd222e0946e</Sha>
+    <Dependency Name="runtime.win-arm64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26523.2">
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-node</Uri>
+      <Sha>8c288428de44adaab8f60963302d0ab511eb5887</Sha>
     </Dependency>
-    <Dependency Name="runtime.win-x64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26517.3">
-      <Uri>https://github.com/dotnet/node</Uri>
-      <Sha>1ab9161aaf6814d105d3aa78c752bfd222e0946e</Sha>
+    <Dependency Name="runtime.win-x64.Microsoft.NETCore.Runtime.Wasm.Node.Transport" Version="11.0.0-alpha.1.26523.2">
+      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-node</Uri>
+      <Sha>8c288428de44adaab8f60963302d0ab511eb5887</Sha>
     </Dependency>
     <Dependency Name="Microsoft.NET.HostModel.TestData" Version="11.0.0-beta.26506.3">
       <Uri>https://github.com/dotnet/runtime-assets</Uri>
diff --git a/eng/Versions.props b/eng/Versions.props
index 5875ac42b07077..0137b8dea7749e 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -30,6 +30,8 @@
     <_DotnetSdkVersion>$(MicrosoftNETWorkloadEmscriptenCurrentManifest110100TransportVersion)</_DotnetSdkVersion>
     <SdkVersionForWorkloadTesting Condition="$([System.String]::Compare('$(_GlobalJsonSdkVersion)', '$(_DotnetSdkVersion)')) &lt;= 0">$(_DotnetSdkVersion)</SdkVersionForWorkloadTesting>
     <SdkVersionForWorkloadTesting Condition="'$(SdkVersionForWorkloadTesting)' == ''">$(_GlobalJsonSdkVersion)</SdkVersionForWorkloadTesting>
+    <!-- Validation only. The SDK from the validation VMR build is not published, so keep the global.json SDK as the workload testing host. -->
+    <SdkVersionForWorkloadTesting>$(_GlobalJsonSdkVersion)</SdkVersionForWorkloadTesting>
     <SdkMajorVersion>$([System.String]::Copy('$(SdkVersionForWorkloadTesting)').Split('.')[0])</SdkMajorVersion>
     <SdkBandVersion>$(SdkMajorVersion).0.100</SdkBandVersion>
     <SdkPreReleaseLabel>$([System.Text.RegularExpressions.Regex]::Match($(SdkVersionForWorkloadTesting), '-(?!rtm|servicing)(.+)\.[^.]+\.[^.]+$').Groups[1].Value)</SdkPreReleaseLabel>
@@ -168,6 +170,8 @@
     <!-- emscripten workload package when testing workloads -->
     <!-- we're using MicrosoftDotNetApiCompatTaskPackageVersion since the emscripten workload package ID contains a changing version. This one uses sdk-style feature band version numbers. -->
     <MicrosoftNETRuntimeEmscriptenVersion>$(MicrosoftDotNetApiCompatTaskPackageVersion)</MicrosoftNETRuntimeEmscriptenVersion>
+    <!-- Validation only. Install the Emscripten workload manifest built by the validation VMR build. -->
+    <MicrosoftNETRuntimeEmscriptenVersion>$(MicrosoftNETWorkloadEmscriptenCurrentManifest110100TransportVersion)</MicrosoftNETRuntimeEmscriptenVersion>
     <NodePackageVersion>$(runtimewinx64MicrosoftNETCoreRuntimeWasmNodeTransportPackageVersion)</NodePackageVersion>
     <!-- The package path for python in src/mono/mono.proj needs to be updated if this changes-->
     <EmsdkVersion>6.0.2</EmsdkVersion>