USN-7256-1 fixed vulnerabilities in Ruby. The update introduced a minor regression. This update fixes the problem.

[Shane1145]

It was discovered that Ruby incorrectly handled parsing of an XML document
that has specific XML characters in an attribute value using REXML gem. An
attacker could use this issue to cause Ruby to crash, resulting in a
denial of service.


https://ubuntu.com/security/notices/USN-7256-2