lib/rexml/text.rb in the REXML parser in Ruby before 1.9.3-p392 allows remote attackers to cause a denial of service (memory consumption and crash) via crafted text nodes in an XML document, aka an XML Entity Expansion (XEE) attack.
https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0092
https://bugzilla.redhat.com/show_bug.cgi?id=914716
http://www.ubuntu.com/usn/USN-1780-1
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2013&m=slackware-security.426862
http://www.securityfocus.com/bid/58141
http://www.ruby-lang.org/en/news/2013/02/22/rexml-dos-2013-02-22/
http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html
http://www.openwall.com/lists/oss-security/2013/03/06/5
http://www.mandriva.com/security/advisories?name=MDVSA-2013:124
http://www.debian.org/security/2013/dsa-2809
http://www.debian.org/security/2013/dsa-2738
http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=39384
http://secunia.com/advisories/52902
http://secunia.com/advisories/52783
http://rhn.redhat.com/errata/RHSA-2013-1147.html
http://rhn.redhat.com/errata/RHSA-2013-1028.html
http://rhn.redhat.com/errata/RHSA-2013-0612.html
http://rhn.redhat.com/errata/RHSA-2013-0611.html
http://lists.opensuse.org/opensuse-updates/2013-04/msg00036.html
http://lists.opensuse.org/opensuse-updates/2013-04/msg00034.html
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00015.html
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00001.html