So now allowed additionally \\ \/ and \s which I need to pass files and parameter into my internal perl script and my CGI started working with -T 
sub untainted_string
{
my ($data) = @_;

if ($data =~ /^([-\@\w.\\\/\s]+)$/)
{
        $data = $1;                     # $data now untainted
}
else
{
        die "Bad data in '$data'";
}
return $data;
}

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So where might I be in danger now? Why -T makes my CGI safer?

In reply to Re^5: Insecure dependency in open while running with -T switch by vit
in thread Insecure dependency in open while running with -T switch by vit

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