libxml2 before 2.8.0 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted XML data.
https://blogs.oracle.com/sunsecurity/entry/cve_2012_0841_denial_of
http://www.xerox.com/download/security/security-bulletin/16287-4d6b7b0c81f7b/cert_XRX13-003_v1.0.pdf
http://www.securityfocus.com/bid/52107
http://www.oracle.com/technetwork/topics/security/cpuapr2013-1899555.html
http://www.openwall.com/lists/oss-security/2012/02/22/1
http://www.mandriva.com/security/advisories?name=MDVSA-2013:150
http://www.debian.org/security/2012/dsa-2417
http://support.apple.com/kb/HT6001
http://support.apple.com/kb/HT5934
http://securitytracker.com/id?1026723
http://secunia.com/advisories/55568
http://secunia.com/advisories/54886
http://rhn.redhat.com/errata/RHSA-2013-0217.html
http://rhn.redhat.com/errata/RHSA-2012-0324.html
http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00002.html
http://lists.apple.com/archives/security-announce/2013/Sep/msg00006.html
http://lists.apple.com/archives/security-announce/2013/Oct/msg00009.html
http://git.gnome.org/browse/libxml2/commit/?id=8973d58b7498fa5100a876815476b81fd1a2412a