During February 2026, Icyplusplus focused on enhancing memory safety in the dotnet/runtime repository by addressing a critical bug in Base64Url decoding. They implemented input validation to ensure only ASCII characters are processed, preventing out-of-bounds reads and potential AccessViolationExceptions. This involved integrating System.Text.Ascii.IsValid checks within the decoding logic, thereby strengthening the robustness of the Base64 and Base64Url code paths for .NET 8. Working in C# with an emphasis on backend development and unit testing, Icyplusplus’s contribution reduced crash risks for downstream applications and improved overall reliability, demonstrating careful attention to detail and a deep understanding of secure coding practices.