The latest version of both major branches of PHP have been released - PHP 4.4.4 and PHP 5.1.5 - fixing some of the major security problems that have been found in recent versions.

PHP development team would like to announce the immediate availability of PHP 5.1.5 and 4.4.4. The two releases address a series of security problems discovered since PHP 5.1.4 and 4.4.3, respectively.

Some of these problems included:

• Added missing safe_mode/open_basedir checks inside the error_log(), file_exists(), imap_open() and imap_reopen() functions.
• Fixed possible open_basedir/safe_mode bypass in cURL extension and on PHP 5.1.5 with realpath cache.
• Fixed a buffer overflow inside sscanf() function.
• Fixed memory_limit restriction on 64 bit system.

All information about the updates for these versions can be found in the Changelogs - PHP 4.4.4 and PHP 5.1.3. It's recommnded that you download these new versions and update your installation.