Net::SFTP::Foreign requires that all the arguments passed to its methods are untainted: 
$opt_remote_dir =~ /^(.*)$/;
$sftp->setcwd($1);
$sftp->error and die "Unable to change directory: " . $sftp->error;

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In reply to Re: untainting Net::SFTP::Foreign by salva
in thread untainting Net::SFTP::Foreign by OldSchool

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