libxslt before 1.1.28 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via an (1) empty match attribute in a XSL key to the xsltAddKey function in keys.c or (2) uninitialized variable to the xsltDocumentFunction function in functions.c.
https://www.suse.com/support/update/announcement/2013/suse-su-20131656-1.html
https://www.suse.com/support/update/announcement/2013/suse-su-20131654-1.html
https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0107
https://git.gnome.org/browse/libxslt/commit/?id=6c99c519d97e5fcbec7a9537d190efb442e4e833
https://bugzilla.gnome.org/show_bug.cgi?id=685330
http://xmlsoft.org/XSLT/news.html
http://www.ubuntu.com/usn/USN-1784-1
http://www.securitytracker.com/id/1028338
http://www.mandriva.com/security/advisories?name=MDVSA-2013:141
http://www.debian.org/security/2013/dsa-2654
http://secunia.com/advisories/52884
http://secunia.com/advisories/52813
http://secunia.com/advisories/52805
http://secunia.com/advisories/52745
http://lists.opensuse.org/opensuse-updates/2013-04/msg00028.html
http://lists.opensuse.org/opensuse-updates/2013-04/msg00020.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/102065.html