In all versions of PHP 7, during the unserialization process, resizing the ‘properties’ hash table of a serialized object may lead to use-after-free. A remote attacker may exploit this bug to gain arbitrary code execution.
www.securityfocus.com/bid/95151
www.securitytracker.com/id/1037659
access.redhat.com/errata/RHSA-2018:1296
blog.checkpoint.com/2016/12/27/check-point-discovers-three-zero-day-vulnerabilities-web-programming-language-php-7
blog.checkpoint.com/wp-content/uploads/2016/12/PHP_Technical_Report.pdf
bugs.php.net/bug.php?id=73092
security.netapp.com/advisory/ntap-20180112-0001/
www.youtube.com/watch?v=LDcaPstAuPk