CVE-2010-1330
The regular expression engine in JRuby before 1.4.1, when $KCODE is set to ‘u’, does not properly handle characters immediately after a UTF-8 character, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted string.
Date published : 2012-11-23
http://www.jruby.org/2010/04/26/jruby-1-4-1-xss-vulnerability.html