While the official client is safe, you should follow these guidelines to avoid infection: Wurst Client | Fandom - Minecraft Wiki
: Unlike some competitors, Wurst does not hide its code (obfuscation), making it easy for users to decompile and verify that the JAR file matches the public source code. Is Wurst Client infected with a virus?
: Every code change is automatically uploaded to VirusTotal and scanned against over 60 antivirus programs, including Windows Defender, Kaspersky, and Malwarebytes. While the official client is safe, you should
: Wurst encrypts user account data stored locally, whereas many other clients store login details in plain text. Critical Precautions While the official client is safe