Heap overflow vulnerability in regcomp.c in the ereg extension in PHP before 5.5.23 on 32-bit systems (CVE-2015-2305).
Integer overflow in zip extension in PHP before 5.5.23 leads to writing past heap boundary (CVE-2015-2331).
Use after free vulnerability in unserialize() in PHP before 5.5.23 (CVE-2015-2787).
PHP has been updated to version 5.5.23, which fixes these issues and other bugs. The php zip extension uses the libzip library, so it has been patched to fix CVE-2015-2331.