%ENV is tainted, meaning $ENV{TEMP} and what not is tainted ...
$ perl -Te "$f=$ENV{TEMP}.q{/junk}; open my($fh), q{>}, $f; "
Insecure dependency in open while running with -T switch at -e line 1.

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In your program write  $ENV{TEMP}='...'; or untaint the other way

In reply to Re^2: Taint error on file upload by Anonymous Monk
in thread Taint error on file upload by Sanjay

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