14 DAY TRIAL // Canonical has released information about the LibYAML regression in its Ubuntu 13.10, Ubuntu 12.10, and Ubuntu 12.04 LTS operating systems.
According to the company, a previous update, USN-2098-1, introduced a regression in LibYAML.
It has been discovered that USN-2098-1 fixed a vulnerability in LibYAML, but the security fix used introduced a regression that caused parsing failures for certain valid YAML files. This update fixes the problem.
For a more detailed description of the problems, you can see Canonical's security notification.
The flaws can be fixed if you upgrade your system(s) to the latest libyaml-0-2 package specific to each distribution. To apply the patch, run the Update Manager application.
In general, a standard system update will make all the necessary changes and you will have to restart all the applications that are using LibYAML.