It is. Coincidentally, security was one of the reasons to uninstall 7-Zip.
The number of reported issues seems to be about the same with WinRAR: https://www.cvedetails.com/vulnerability-list/vendor_id-1914/product_id-3768/Rarlab-Winrar.html
There’s barely any CVEs on that page. It’s likely a security researcher did some fuzzing of the executable and found a few issues at once.
Have you looked at how many vulnerabilities there’s been in things like Windows, MacOS, Chrome, etc?