The developer of 7-zip has a questionable approach to security for an application that's meant to handle untrusted files, he prioritizes small binary size above hardening against exploits most of the time. DEP was disabled until 64-bit Windows forced the issue by making it mandatory, ASLR was disabled until fairly recently because he considered relocation tables to be unnecessary bloat, and the more advanced mitigations like CET and CFG still aren't used to this day. I don't know how robust the actual code is, but an attitude of executable size being the most important metric doesn't fill me with confidence that it tries to handle all possible edge cases.

With Windows 11 now having support for 7z/rar/etc built-in I'd be inclined to just default to using that if it covers your use-cases.