This update for tomcat to 9.0.12 fixes the following issues:
See the full changelog at:
http://tomcat.apache.org/tomcat-9.0-doc/changelog.html#Tomcat9.0.12(markt)
Security issues fixed:
CVE-2018-11784: When the default servlet in Apache Tomcat returned
a redirect to a directory (e.g. redirecting to '/foo/' when the user
requested '/foo') a specially crafted URL could be used to cause the
redirect to be generated to any URI of the attackers choice. (bsc#1110850)