Incorrect handling of paths with NULs (CVE-2015-4598).
OS command injection vulnerability in escapeshellarg (CVE-2015-4642).
Integer overflow in ftp_genlist() resulting in heap overflow (CVE-2015-4643).
Segfault in phppgsqlmeta_data (CVE-2015-4644).
PHP has been updated to version 5.5.26, which fixes multiple bugs and potential security issues. Please see the upstream ChangeLog for details.