PHP contains a flaw that may allow a context-dependent denial of service. The issue is triggered when a use-after-free error in the Zend engine occurs, allowing a context-dependent attacker to use vectors related to the '__set', '__get', '__isset' and '__unset' methods to cause a denial of service, or possibly have other unspecified impact.
Local / Remote,
Loss of Availability
Upgrade to version 5.2.15, 5.3.4 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.