PHP 5.3.9 along with any older versions for which the hash collision DoS patch was backported, are affected, Eiram said.

The PHP development team has released version 5.3.9 of the popular Web development platform in order to address a recently disclosed denial-of-service (DoS) vulnerability, as well as other ...

A similar exploit for the PHP version would not be hard to produce. “All users are strongly encouraged to upgrade to PHP 5.3.9,” the platform’s developers said.