PHP up to 5.4.36/5.5.20/5.6.4 unserialize denial of service

A vulnerability classified as problematic was found in PHP up to 5.4.36/5.5.20/5.6.4. Affected by this vulnerability is the function unserialize. Upgrading to version 5.4.37, 5.5.21 or 5.6.5 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 19329.