diff --git a/src/Hosting/Abstractions/src/Microsoft.AspNetCore.Hosting.Abstractions.csproj b/src/Hosting/Abstractions/src/Microsoft.AspNetCore.Hosting.Abstractions.csproj
index cdcf26e2a546..9ced7e13a326 100644
--- a/src/Hosting/Abstractions/src/Microsoft.AspNetCore.Hosting.Abstractions.csproj
+++ b/src/Hosting/Abstractions/src/Microsoft.AspNetCore.Hosting.Abstractions.csproj
@@ -4,6 +4,7 @@
     <Description>ASP.NET Core hosting and startup abstractions for web applications.</Description>
     <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;hosting</PackageTags>
     <IsPackable>false</IsPackable>
@@ -14,6 +15,8 @@
     <Reference Include="Microsoft.AspNetCore.Hosting.Server.Abstractions" />
     <Reference Include="Microsoft.AspNetCore.Http.Abstractions" />
     <Reference Include="Microsoft.Extensions.Hosting.Abstractions" />
+
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Hosting/Hosting/src/Microsoft.AspNetCore.Hosting.csproj b/src/Hosting/Hosting/src/Microsoft.AspNetCore.Hosting.csproj
index d64782593742..33d17c652381 100644
--- a/src/Hosting/Hosting/src/Microsoft.AspNetCore.Hosting.csproj
+++ b/src/Hosting/Hosting/src/Microsoft.AspNetCore.Hosting.csproj
@@ -4,6 +4,7 @@
     <Description>ASP.NET Core hosting infrastructure and startup logic for web applications.</Description>
     <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;hosting</PackageTags>
     <IsPackable>false</IsPackable>
@@ -31,6 +32,7 @@
     <Reference Include="Microsoft.Extensions.Options" />
 
     <Compile Include="$(SharedSourceRoot)TypeNameHelper\*.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Hosting/Server.Abstractions/src/Microsoft.AspNetCore.Hosting.Server.Abstractions.csproj b/src/Hosting/Server.Abstractions/src/Microsoft.AspNetCore.Hosting.Server.Abstractions.csproj
index ef3ae05a8908..e753d69414d6 100644
--- a/src/Hosting/Server.Abstractions/src/Microsoft.AspNetCore.Hosting.Server.Abstractions.csproj
+++ b/src/Hosting/Server.Abstractions/src/Microsoft.AspNetCore.Hosting.Server.Abstractions.csproj
@@ -4,6 +4,7 @@
     <Description>ASP.NET Core hosting server abstractions for web applications.</Description>
     <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;hosting</PackageTags>
     <IsPackable>false</IsPackable>
@@ -13,6 +14,8 @@
   <ItemGroup>
     <Reference Include="Microsoft.AspNetCore.Http.Features" />
     <Reference Include="Microsoft.Extensions.Configuration.Abstractions" />
+
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Http/Headers/src/Microsoft.Net.Http.Headers.csproj b/src/Http/Headers/src/Microsoft.Net.Http.Headers.csproj
index afde882724f6..7ef5f675ab46 100644
--- a/src/Http/Headers/src/Microsoft.Net.Http.Headers.csproj
+++ b/src/Http/Headers/src/Microsoft.Net.Http.Headers.csproj
@@ -16,4 +16,8 @@
     <Reference Include="Microsoft.Extensions.Primitives" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
+  </ItemGroup>
+
 </Project>
diff --git a/src/Http/Http.Abstractions/src/Microsoft.AspNetCore.Http.Abstractions.csproj b/src/Http/Http.Abstractions/src/Microsoft.AspNetCore.Http.Abstractions.csproj
index 97b9d0dd6479..62f35b2c3f25 100644
--- a/src/Http/Http.Abstractions/src/Microsoft.AspNetCore.Http.Abstractions.csproj
+++ b/src/Http/Http.Abstractions/src/Microsoft.AspNetCore.Http.Abstractions.csproj
@@ -12,6 +12,7 @@ Microsoft.AspNetCore.Http.HttpResponse</Description>
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore</PackageTags>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IsPackable>false</IsPackable>
     <Nullable>enable</Nullable>
   </PropertyGroup>
@@ -23,6 +24,7 @@ Microsoft.AspNetCore.Http.HttpResponse</Description>
     <Compile Include="$(SharedSourceRoot)ActivatorUtilities\*.cs" />
     <Compile Include="$(SharedSourceRoot)ParameterDefaultValue\*.cs" />
     <Compile Include="$(SharedSourceRoot)PropertyHelper\**\*.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Http/Http.Extensions/src/Microsoft.AspNetCore.Http.Extensions.csproj b/src/Http/Http.Extensions/src/Microsoft.AspNetCore.Http.Extensions.csproj
index 509ba8159830..49f50417e4e0 100644
--- a/src/Http/Http.Extensions/src/Microsoft.AspNetCore.Http.Extensions.csproj
+++ b/src/Http/Http.Extensions/src/Microsoft.AspNetCore.Http.Extensions.csproj
@@ -5,6 +5,7 @@
     <TargetFramework>$(DefaultNetCoreTargetFramework)</TargetFramework>
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore</PackageTags>
     <IsPackable>false</IsPackable>
@@ -13,6 +14,7 @@
 
   <ItemGroup>
     <Compile Include="..\..\Shared\StreamCopyOperationInternal.cs" Link="StreamCopyOperationInternal.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Http/Http.Features/src/Microsoft.AspNetCore.Http.Features.csproj b/src/Http/Http.Features/src/Microsoft.AspNetCore.Http.Features.csproj
index dda22adeabb8..af70d8d5e18f 100644
--- a/src/Http/Http.Features/src/Microsoft.AspNetCore.Http.Features.csproj
+++ b/src/Http/Http.Features/src/Microsoft.AspNetCore.Http.Features.csproj
@@ -6,6 +6,7 @@
     <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore</PackageTags>
     <Nullable>enable</Nullable>
@@ -15,6 +16,8 @@
   <ItemGroup>
     <Reference Include="Microsoft.Extensions.Primitives" />
     <Reference Include="System.IO.Pipelines" />
+
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Http/Http/src/Microsoft.AspNetCore.Http.csproj b/src/Http/Http/src/Microsoft.AspNetCore.Http.csproj
index 722a7ade1e61..3cc24ad0c7c1 100644
--- a/src/Http/Http/src/Microsoft.AspNetCore.Http.csproj
+++ b/src/Http/Http/src/Microsoft.AspNetCore.Http.csproj
@@ -17,6 +17,7 @@
     <Compile Include="$(SharedSourceRoot)ValueTaskExtensions\**\*.cs" />
     <Compile Include="..\..\Shared\StreamCopyOperationInternal.cs" Link="Internal\StreamCopyOperationInternal.cs" />
     <Compile Include="..\..\WebUtilities\src\AspNetCoreTempDirectory.cs" LinkBase="Internal" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Http/Routing.Abstractions/src/Microsoft.AspNetCore.Routing.Abstractions.csproj b/src/Http/Routing.Abstractions/src/Microsoft.AspNetCore.Routing.Abstractions.csproj
index db1aa002e84f..0a0d4a8f0018 100644
--- a/src/Http/Routing.Abstractions/src/Microsoft.AspNetCore.Routing.Abstractions.csproj
+++ b/src/Http/Routing.Abstractions/src/Microsoft.AspNetCore.Routing.Abstractions.csproj
@@ -9,12 +9,14 @@ Microsoft.AspNetCore.Routing.RouteData</Description>
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;routing</PackageTags>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IsPackable>false</IsPackable>
     <Nullable>annotations</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
     <Compile Include="$(SharedSourceRoot)PropertyHelper\*.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Http/Routing/src/Microsoft.AspNetCore.Routing.csproj b/src/Http/Routing/src/Microsoft.AspNetCore.Routing.csproj
index e96f32ceddf5..d84a5a205d03 100644
--- a/src/Http/Routing/src/Microsoft.AspNetCore.Routing.csproj
+++ b/src/Http/Routing/src/Microsoft.AspNetCore.Routing.csproj
@@ -24,6 +24,7 @@ Microsoft.AspNetCore.Routing.RouteCollection</Description>
 
   <ItemGroup>
     <Compile Include="$(SharedSourceRoot)PropertyHelper\*.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Http/WebUtilities/src/Microsoft.AspNetCore.WebUtilities.csproj b/src/Http/WebUtilities/src/Microsoft.AspNetCore.WebUtilities.csproj
index d165fe972721..f0998415939f 100644
--- a/src/Http/WebUtilities/src/Microsoft.AspNetCore.WebUtilities.csproj
+++ b/src/Http/WebUtilities/src/Microsoft.AspNetCore.WebUtilities.csproj
@@ -6,6 +6,7 @@
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
     <DefineConstants>$(DefineConstants);WebEncoders_In_WebUtilities</DefineConstants>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore</PackageTags>
     <IsPackable>false</IsPackable>
@@ -15,6 +16,7 @@
   <ItemGroup>
     <Compile Include="$(SharedSourceRoot)WebEncoders\**\*.cs" />
     <Compile Include="$(SharedSourceRoot)UrlDecoder\**\*.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Servers/Connections.Abstractions/src/Microsoft.AspNetCore.Connections.Abstractions.csproj b/src/Servers/Connections.Abstractions/src/Microsoft.AspNetCore.Connections.Abstractions.csproj
index 39732e90e605..6d0851c459b8 100644
--- a/src/Servers/Connections.Abstractions/src/Microsoft.AspNetCore.Connections.Abstractions.csproj
+++ b/src/Servers/Connections.Abstractions/src/Microsoft.AspNetCore.Connections.Abstractions.csproj
@@ -8,6 +8,7 @@
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore</PackageTags>
     <NoWarn>CS1591;$(NoWarn)</NoWarn>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
@@ -17,6 +18,7 @@
     <Compile Include="$(SharedSourceRoot)ActivatorUtilities\*.cs" />
     <Compile Include="$(SharedSourceRoot)ParameterDefaultValue\*.cs" />
     <Compile Include="$(SharedSourceRoot)CodeAnalysis\*.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == '$(DefaultNetFxTargetFramework)'">
diff --git a/src/Servers/Kestrel/Core/src/Microsoft.AspNetCore.Server.Kestrel.Core.csproj b/src/Servers/Kestrel/Core/src/Microsoft.AspNetCore.Server.Kestrel.Core.csproj
index 3e5b8115d18a..24feed7f32e6 100644
--- a/src/Servers/Kestrel/Core/src/Microsoft.AspNetCore.Server.Kestrel.Core.csproj
+++ b/src/Servers/Kestrel/Core/src/Microsoft.AspNetCore.Server.Kestrel.Core.csproj
@@ -23,6 +23,8 @@
     <Compile Include="$(SharedSourceRoot)Hpack\**\*.cs" Link="Shared\Hpack\%(Filename)%(Extension)" />
     <Compile Include="$(SharedSourceRoot)ServerInfrastructure\**\*.cs" />
     <Compile Include="$(RepoRoot)src\Shared\TaskToApm.cs" Link="Internal\TaskToApm.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
+
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Servers/Kestrel/Kestrel/src/Microsoft.AspNetCore.Server.Kestrel.csproj b/src/Servers/Kestrel/Kestrel/src/Microsoft.AspNetCore.Server.Kestrel.csproj
index a2b65d0bfe2f..670a89ca1366 100644
--- a/src/Servers/Kestrel/Kestrel/src/Microsoft.AspNetCore.Server.Kestrel.csproj
+++ b/src/Servers/Kestrel/Kestrel/src/Microsoft.AspNetCore.Server.Kestrel.csproj
@@ -6,6 +6,7 @@
     <IsAspNetCoreApp>true</IsAspNetCoreApp>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageTags>aspnetcore;kestrel</PackageTags>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IsPackable>false</IsPackable>
     <Nullable>enable</Nullable>
   </PropertyGroup>
@@ -14,6 +15,8 @@
     <Reference Include="Microsoft.AspNetCore.Hosting" />
     <Reference Include="Microsoft.AspNetCore.Server.Kestrel.Core" />
     <Reference Include="Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets" />
+
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Servers/Kestrel/Transport.Libuv/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.csproj b/src/Servers/Kestrel/Transport.Libuv/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.csproj
index 37fdb302f780..3f38a043d806 100644
--- a/src/Servers/Kestrel/Transport.Libuv/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.csproj
+++ b/src/Servers/Kestrel/Transport.Libuv/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv.csproj
@@ -17,6 +17,7 @@
     <Compile Include="$(KestrelSharedSourceRoot)\TransportConnection.cs" Link="Internal\TransportConnection.cs" />
     <Compile Include="$(KestrelSharedSourceRoot)\TransportConnection.Generated.cs" Link="Internal\TransportConnection.Generated.cs" />
     <Compile Include="$(KestrelSharedSourceRoot)\TransportConnection.FeatureCollection.cs" Link="Internal\TransportConnection.FeatureCollection.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Servers/Kestrel/Transport.Quic/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Experimental.Quic.csproj b/src/Servers/Kestrel/Transport.Quic/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Experimental.Quic.csproj
index 9e80a4db40b9..ca9a422a9553 100644
--- a/src/Servers/Kestrel/Transport.Quic/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Experimental.Quic.csproj
+++ b/src/Servers/Kestrel/Transport.Quic/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Experimental.Quic.csproj
@@ -20,6 +20,7 @@
     <Compile Include="$(KestrelSharedSourceRoot)\TransportMultiplexedConnection.Generated.cs" Link="Internal\TransportMultiplexedConnection.Generated.cs" />
     <Compile Include="$(KestrelSharedSourceRoot)\TransportMultiplexedConnection.FeatureCollection.cs" Link="Internal\TransportMultiplexedConnection.FeatureCollection.cs" />
     <Compile Include="$(RepoRoot)src\Shared\TaskToApm.cs" Link="Internal\TaskToApm.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Servers/Kestrel/Transport.Sockets/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.csproj b/src/Servers/Kestrel/Transport.Sockets/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.csproj
index 278fed94dd95..c341c1e95144 100644
--- a/src/Servers/Kestrel/Transport.Sockets/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.csproj
+++ b/src/Servers/Kestrel/Transport.Sockets/src/Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <Description>Managed socket transport for the ASP.NET Core Kestrel cross-platform web server.</Description>
@@ -18,6 +18,7 @@
     <Compile Include="$(KestrelSharedSourceRoot)\TransportConnection.cs" Link="Internal\TransportConnection.cs" />
     <Compile Include="$(KestrelSharedSourceRoot)\TransportConnection.Generated.cs" Link="Internal\TransportConnection.Generated.cs" />
     <Compile Include="$(KestrelSharedSourceRoot)\TransportConnection.FeatureCollection.cs" Link="Internal\TransportConnection.FeatureCollection.cs" />
+    <Compile Include="$(SharedSourceRoot)SkipLocalsInit.cs" LinkBase="Shared\SkipLocalsInit.cs" />
   </ItemGroup>
 
   <ItemGroup>
diff --git a/src/Shared/SkipLocalsInit.cs b/src/Shared/SkipLocalsInit.cs
new file mode 100644
index 000000000000..426c95ac0a93
--- /dev/null
+++ b/src/Shared/SkipLocalsInit.cs
@@ -0,0 +1,15 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+// Used to indicate to the compiler that the .locals init flag should not be set in method headers.
+#if NET6_0
+[module: System.Runtime.CompilerServices.SkipLocalsInit]
+#elif NETSTANDARD2_0
+// Not available
+#elif NETSTANDARD2_1
+// Not available
+#elif NET461
+// Not available
+#else
+#error Target frameworks need to be updated.
+#endif