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.NET 10 Officially Released with Major Performance, AI, and Developer Experience Improvements
Microsoft announced the general availability of .NET 10, describing it as the most productive, modern, secure, and high-performance version of the platform to date. As stated by the company, the release is the result of a year-long effort involving thousands of contributors. It includes improvements across the runtime, libraries, languages, tools, frameworks, and workloads.
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Microsoft Patches Critical ASP.NET Core Vulnerability with 9.9 Severity Score
Microsoft recently released a security advisory and patched a critical vulnerability in ASP.NET Core that allows an attacker to bypass a security feature over a network due to an inconsistent interpretation of HTTP requests. With a CVSS score of 9.9 out of 10, CVE-2025-55315 is the highest-rated Microsoft vulnerability.
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Dev Proxy v1.3.0: HAR File Generation, LLM Usage Tracking, and Enhanced API Testing Feature
Dev Proxy v1.3.0 has been released, introducing several new features aimed at improving debugging, testing, and API monitoring. The update includes two new plugins, HAR file generation for standardized network tracing and OpenAI usage tracking for better visibility into AI-related costs, along with enhancements to permissions analysis, OpenAPI specification generation, and overall stability.
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New NuGet.org Sponsorship Feature Enables Developers to Support Package Authors
Microsoft has announced a new Sponsorship feature on NuGet.org, designed to help package maintainers receive direct financial support from the community. As stated in the official announcement, the goal is to “make it easier than ever for consumers to recognize and support the authors behind their favorite packages,” while strengthening the overall .NET ecosystem.
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.NET 10 Release Candidate 2: Finalizes SDK, MAUI Stabilization, and MSBuild Enhancements ahead of GA
Microsoft has released .NET 10 Release Candidate 2, the final pre-release build before general availability. As reported by the .NET team, RC 2 ships with a go-live support license, enabling production deployment while allowing developers to validate the platform ahead of its official release. The build is supported in Visual Studio 2026 Insiders and Visual Studio Code with the C# Dev Kit.
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.NET Aspire 9.5 Released: New CLI Update Command, Dashboard AI Visualizer, and Expanded Integrations
Microsoft has announced the Aspire 9.5 as the latest minor release of the platform, introducing support for .NET 8 Long Term Support, .NET 9 Standard Term Support (STS), and the .NET 10 Release Candidate 1. As noted by the team, Aspire releases are delivered independently from the .NET release schedule, with major versions aligned to .NET milestones and minor versions released more frequently.
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Microsoft Extends Support Period for .NET Standard Term Support (STS) Releases from 18 to 24 Months
Microsoft announced an extension to its .NET Standard Term Support releases from 18 months to 24 months, as reported on the company's official development blog. The policy change, effective with .NET 9, will extend support for the latest release until November 10, 2026, matching the end-of-support date for .NET 8, a Long Term Support version.
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.NET 10 RC 1: Introduces Persistent State in Blazor, Enhanced Validation, and Production-Ready Tools
Last week, Microsoft announced the release of .NET 10 RC 1, the first of two release candidates ahead of the final version. As stated by the .NET team, this build comes with a go-live license, allowing developers to use it in production environments with official support. It is available alongside Visual Studio 2026 Insiders and is supported in Visual Studio Code through the C# Dev Kit.
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.NET 10 Preview 7 Delivers ASP.NET Core, Blazor, and MAUI Enhancements, with C# 14 Feature Complete
Microsoft's .NET 10 Preview 7 showcases significant enhancements across ASP.NET Core, C#, .NET MAUI, and Windows Forms. Key updates include easier exception handling, improved cookie and passkey authentication, and a clearer local development experience with .localhost support. C# 14 reaches feature completeness, while .NET MAUI optimizes build performance.
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MCP C# SDK Aligns with New Protocol Specification, Bringing Security and Tooling Updates
The Model Context Protocol (MCP) C# SDK has been updated to support the latest specification, version 2025-06-18. As reported, this release introduces several new features for .NET developers working on AI applications, including an updated authentication protocol, elicitation support, structured tool output, and resource links in tool responses.
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Dev Proxy Reaches v1.0 with AI Failure Simulation, Token Rate Limiting, and Integration Enhancements
Dev Proxy has reached a significant milestone with the release of version 1.0, introducing a range of new features aimed at helping developers build more reliable AI-powered applications. As reported in the announcement, the update focuses on realistic simulation of language model behavior, advanced resource tracking, and improvements to integration tools
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.NET Aspire 9.4 Released with CLI GA, Interactive Dashboards, and Advanced Deployment Features
.NET Aspire 9.4 has been released as the latest minor version of the cloud-native application development stack, marking its most significant update to date. As reported by Microsoft, this release introduces a range of enhancements focused on developer experience, deployment automation, and deeper integration across cloud services and local environments.
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.NET 10 Preview 6 Introduces Blazor Enhancements, Memory Optimization, and SDK Improvements
Microsoft has announced the sixth preview of .NET 10, introducing a broad range of enhancements across the .NET Runtime, SDK, libraries, C#, ASP.NET Core, Blazor, and .NET MAUI. As stated in the official release, the update focuses on improving performance, developer experience, and cross-platform tooling.
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.NET 10 Preview 5 Brings Blazor Observability, XAML Simplification and More
Earlier this month, Microsoft announced the release of .NET 10 Preview 5, delivering updates across multiple components, including ASP.NET Core, .NET MAUI, Windows Presentation Foundation (WPF), and Entity Framework Core, and more. As reported, this preview introduces new features and improvements to enhance developer productivity, application observability, and customization.
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Dev Proxy v0.28 Introduces Telemetry for LLM Usage and Cost Analysis
The .NET team has released Dev Proxy version 0.28, introducing new capabilities aimed at improving observability, plugin extensibility, and integration with AI models. A central feature of this release is the OpenAITelemetryPlugin, which, as reported, allows developers to track usage and estimated costs of OpenAI and Azure OpenAI language model requests within their applications.