in reply to security issues and hacker problems

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Of course perlsec is also a must read...

Of course, the main Perl vulnerability, is the bad programming practices...
This is often NOT related to Perl.
Some scripts are "known" to be poorly coded
(see all the discussions about Matt's script archive or better the davorg's project to rewrite them properly...)

"Only Bad Coders Code Badly In Perl" (OBC2BIP)