php: Invalid read when wddx decodes empty boolean element

The phpwddxpushelement function in ext/wddx/wddx.c in PHP before 5.6.29 and 7.x before 7.0.14 allows remote attackers to cause a denial of service out-of-bounds read and memory corruption or possibly have unspecified other impact via an empty boolean element in a wddxPacket XML document...