Microsoft has released .NET 11 Preview 6 and servicing updates for .NET 8, .NET 9, and .NET 10, addressing 17 critical vulnerabilities and marking the approach of the November 10 end-of-support deadline for the older platforms. Developers using .NET 8 or 9 have about four months to apply patches and migrate to ensure ongoing security updates, as these versions will no longer receive support after the deadline. The latest updates include significant features such as C# unions, CoreCLR for MAUI, and important improvements to the JIT compiler, making .NET 10 the recommended Long-Term Support (LTS) version through November 2028. Microsoft emphasizes the urgency for developers to transition from older versions to .NET 10 before the end-of-support date, with tools like GitHub Copilot available to assist in the migration process
.NET 11 Preview 6 Lands: July Security Patches, C# Unions, and the November 10 Deadline
Microsoft has released simultaneous servicing updates for .NET 8, .NET 9, and .NET 10, alongside the sixth preview of .NET 11, all patching 17 critical vulnerabilities. .NET 11 Preview 6 ships C# unions, OpenAPI 3.2 defaults, and CoreCLR for MAUI, while the current platforms sprint toward their November 10 end-of-support date. Developers running .NET 8 or 9 have roughly four months to apply patches and migrate before security updates dry up. .NET 10 remains the recommended LTS path for production, extending support through November 2028 with significant JIT and post-quantum cryptography improvements.
