Multiple memory leaks in the OpenSSL extension in PHP before 5.3.6 might allow remote attackers to cause a denial of service (memory consumption) via (1) plaintext data to the openssl_encrypt function or (2) ciphertext data to the openssl_decrypt function.
http://bugs.php.net/bug.php?id=54060
http://bugs.php.net/bug.php?id=54061
http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html
http://support.apple.com/kb/HT5002
http://www.mandriva.com/security/advisories?name=MDVSA-2011:053
http://www.php.net/ChangeLog-5.php