Jenkins before 1.502 and LTS before 1.480.3 allows remote authenticated users with write access to cause a denial of service via a crafted payload.
rhn.redhat.com/errata/RHSA-2013-0638.html
www.cloudbees.com/jenkins-advisory/jenkins-security-advisory-2013-02-16.cb
www.openwall.com/lists/oss-security/2013/02/21/7
www.securityfocus.com/bid/57994
bugzilla.redhat.com/show_bug.cgi?id=914879
wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2013-02-16