The 6.x series introduced several performance and usability upgrades:
Improved RAR5 compression speeds on modern CPUs with eight or more threads. Download WinRAR6b zip
Critical security updates, including fixes for CVE-2023-38831 and CVE-2023-40477 , were released in version 6.23 to prevent remote code execution. How to Download and Install Safely including fixes for CVE-2023-38831 and CVE-2023-40477