This repo is used for servicing PR's for .NET Core 2.1 and 3.1. Please visit us at
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.NET Core Libraries (CoreFX)

Build Status

This repo contains the library implementation (called "CoreFX") for .NET Core. It includes System.Collections, System.IO, System.Xml, and many other components. The corresponding .NET Core Runtime repo (called "CoreCLR") contains the runtime implementation for .NET Core. It includes RyuJIT, the .NET GC, and many other components. Runtime-specific library code (System.Private.CoreLib) lives in the CoreCLR repo. It needs to be built and versioned in tandem with the runtime. The rest of CoreFX is agnostic of runtime-implementation and can be run on any compatible .NET runtime (e.g. CoreRT).

.NET Core

Official Starting Page:

How to Engage, Contribute and Provide Feedback

Some of the best ways to contribute are to try things out, file bugs, join in design conversations, and fix issues.

If you are having issues with the "full" .NET Framework (also called "Desktop"), the best way to file a bug is the Report a Problem tool, which is integrated with the VS Developer Community Portal; or through Product Support if you have a contract.

Issue Guide

Each issue area has one or more Microsoft owners, who are listed here. There's also some information there about how we use issues in this repo.

Contributing Guide

We welcome contributions! Many people all over the world have helped make this project better. You'll want to check out:

Useful Links


This project has adopted the code of conduct defined by the Contributor Covenant to clarify expected behavior in our community. For more information, see the .NET Foundation Code of Conduct.

Reporting security issues and security bugs

Security issues and bugs should be reported privately, via email, to the Microsoft Security Response Center (MSRC) [email protected]. You should receive a response within 24 hours. If for some reason you do not, please follow up via email to ensure we received your original message. Further information, including the MSRC PGP key, can be found in the Security TechCenter.

Also see info about related Microsoft .NET Core and ASP.NET Core Bug Bounty Program.

.NET Foundation

.NET Core is a .NET Foundation project.

There are many .NET related projects on GitHub.

  • .NET home repo - links to 100s of .NET projects, from Microsoft and the community.
  • ASP.NET Core home - the best place to start learning about ASP.NET Core.

CoreFX Project

Daily Builds

Daily builds of .NET Core components are published to dotnet-blob feed ( The latest version number of each library can be seen in that feed. Currently, there is no website to visualize the contents of the feed, so in order to do so, you have to use a NuGet feed explorer, like Visual Studio.

Note: See officially supported OS versions.


.NET (including the runtime repo) is licensed under the MIT license.

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