With the upload carefully watched by Andreas, my final work for the 2009 QA Hackathon was to issue a new release of Acme::BadExample, specifically intended to be bad for the CPAN infrastrcture (and to force it to fix an exploit that has long remained open).
package Acme::BadExample;
$VERSION = do { ++$_ while 1; return $_ };
It should be pretty obvious something is vulnerable to the problem when updates stop completely.