.NET 9.0.5 release carries security fixes and non-security fixes. Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 9.0.xxx and .NET 8.0.xxx SDK. This advisory also provides guidance on what developers can do to update their applications to address this vulnerability. A vulnerability exists in .NET SDK or MSBuild applications where external control of file name or path allows an unauthorized attacked to perform spoofing over a network. You need Visual Studio 17.12 or later to use .NET 9.0 on Windows. While not officially supported, we’ve also enabled rudimentary support for .NET 9 in Visual Studio for Mac. Users have to enable a preview feature in Preferences to enable the IDE to discover and use the .NET 9 SDK for creating, loading, building, and debugging projects. The C# extension for Visual Studio Code supports .NET 9.0 and C# 12.
 
While there is a lot of feature compatibility with older versions, it does not have what you would call code compatibility meaning that you can't just run your old ASP.NET code in ASP.NET Core without a fair bit of change.
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