CoreText in Apple iOS before 8.4.1 and OS X before 10.10.5 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted font file, a different vulnerability than CVE-2015-5755.
lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
lists.apple.com/archives/security-announce/2015/Aug/msg00002.html
lists.apple.com/archives/security-announce/2015/Sep/msg00003.html
www.securityfocus.com/bid/76343
www.securitytracker.com/id/1033275
support.apple.com/HT205221
support.apple.com/kb/HT205030
support.apple.com/kb/HT205031