Amazon Linux AMI Security Advisory: ALAS-2015-481
Advisory Release Date: 2015-02-11 19:50 Pacific
An assertion failure was found in the way the libyaml library parsed wrapped strings. An attacker able to load specially crafted YAML input into an application using libyaml could cause the application to crash. (CVE-2014-9130 )
Run yum update libyaml to update your system.