Tainting is a way of marking information that might be a potential security issue (e.g. provided by the user, can be overridden by a third party, etc.). Trying to use tainted data causes your program to die - preventing any potential damage.

See perlsec for full details.

In reply to Re: So, now what are taints? by adrianh
in thread So, now what are taints? by muba

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