ext/standard/var_unserializer.re in PHP before 5.6.26 mishandles object-deserialization failures, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via an unserialize call that references a partially constructed object. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7411
