Here's the changelist: http://www.php.net/ChangeLog-5.php#5.5.1 And here's a sec...

		canadev on July 19, 2013 \| parent \| context \| favorite \| on: PHP 5.5.1 Release Announcement Here's the changelist: http://www.php.net/ChangeLog-5.php#5.5.1 And here's a security fix regarding heap corruption in XML parsing: https://bugs.php.net/bug.php?id=65236