It is. Coincidentally, security was one of the reasons to uninstall 7-Zip.
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?
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