Carbon in Apple OS X before 10.11.4 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted .dfont file.
https://support.apple.com/HT206167
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-2832
http://www.securitytracker.com/id/1035363
http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html