.NET News June 2025: Preview 5, EF Core 10, Rider 2025.2, and a Security Fix

June 2025 delivered .NET 10 Preview 5 with Post-Quantum Cryptography and C# 14 compound assignment operators, a security fix for CVE-2025-30399 you should already have applied, EF Core 10 LeftJoin/RightJoin and native JSON column support, and Rider 2025.2 EAP tracking the full C# 14 surface area.