The .7z format itself is safe and open-source. However, like any archive, it can contain malicious executable files inside. You should always scan the extracted contents for viruses before running them.
If you're looking to work with files or the 7-Zip software, here’s a breakdown of how to manage these archives, their security, and how they compare to standard ZIP files. 🗄️ How to Open and Extract .7z Files like any archive
A highly rated open-source alternative to 7-Zip that provides a modern interface for managing archives. like any archive