Microsoft has released .NET 11 Preview 7, making NativeAOT the default in the CLI for improved startup performance and introducing new C# 15 features. Alongside this, security updates for .NET versions 8, 9, and 10 address ten critical vulnerabilities, including two remote code execution flaws that require immediate attention. Developers are encouraged to migrate from .NET 8 and 9 as they approach their end-of-support date on November 10, 2026. The release also includes significant library enhancements, such as new decimal types and ZIP password encryption, while emphasizing the importance of updating and testing before moving to production

.NET 11 Preview 7, NativeAOT Default, and Security Fixes for 10 CVEs

Microsoft released .NET 11 Preview 7, moving NativeAOT to default in the CLI for major startup performance improvements and adding C# 15 features like union patterns and labeled loop control. Simultaneously, security servicing updates for .NET 8, 9, and 10 address ten CVEs, including two critical remote code execution vulnerabilities that demand immediate patching. Developers should prioritize migration from .NET 8 and 9, both of which reach end-of-support on November 10, 2026, just three months away. The preview concludes a dense release window with significant library additions, including IEEE 754 decimal types and ZIP password encryption, ahead of .NET 11's STS target date.

.NET 11 Preview 7, NativeAOT Default, and Security Fixes for 10 CVEs @ NT Compatible