Oh wow, I always assumed he just defaulted to HTTP version of the site, but HTTPS was an option. But nope, there isn't even a version of the site served over HTTPS. In the year 2018.
sigh already downloaded the source, trying to convince myself I need to do this. The code is pretty much pure C++98 along with all the pain that comes with that.
I also lost my trust into zlib recently, given that the current released version is full of bugs, and the current master is written horribly. Not as bad as openssl, but close.
E.g. they are still using K&R sigs, wrong casts, and have several copy&paste bugs which you only detect with a stricter c++ compiler.
for just decompression, unarchiver has free software implementation of unrar. for compression, use command line (tar -J, zip, whatever) or file roller.
p7zip was also patched. 18.00 doesn't have the bug, but it looks like Peazip hasn't been updated with it.
I'm not sure what other FOSS alternative to use. BandiZip is free (as in beer) but doesn't seem to have an update since Sept, so if it uses p7zip under the hood for 7z, it's also vulnerable.