Taint mode was designed to protect against a shell user who can set environment variables, which is why it ignores $PERL5LIB. In a Web application, however, the environment is not under the control of a potential attacker, so it's not a threat. In many of my perl scripts, I use this code to pay attention to $PERL5LIB even in taint mode: 
BEGIN {
  # Blindly untaint.  Taintchecking is to protect from Web data;
  # the environment is under our control.
  if ($ENV{PERL5LIB} and $ENV{PERL5LIB} =~ /^(.*)$/)
  {
    eval "use lib '$_';"
        foreach (reverse split(/:/,$1));
  }
  if ($ENV{PATH} and $ENV{PATH} =~ /^(.*)$/)
  {
      $ENV{PATH}=$1;
  }
}

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In reply to Re: how to add web hosting account-wide use lib ? by sgifford
in thread how to add web hosting account-wide use lib ? by leocharre

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