Your problem can be demonstrated using 

perl -Te'printf $ARGV[0]' foo

[download]

The first argument of printf (optional fh aside) is the format pattern. It makes sense to require the pattern to be trusted. Consider %n, for example.

printf $fh <<EOMEOM;
should be
printf $fh "%s", <<EOMEOM;
or simply
print $fh <<EOMEOM;

Your code is buggy, and 5.10 catches your bug.

In reply to Re^3: Taint, CGI and perl 5.10 by ikegami
in thread Taint, CGI and perl 5.10 by nextguru

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