CoreText in Apple Mac OS X 10.4 through 10.4.10 allows attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted text content that triggers an access of an uninitialized object pointer.
https://exchange.xforce.ibmcloud.com/vulnerabilities/38465
https://euvd.enisa.europa.eu/vulnerability/EUVD-2007-4664
http://www.vupen.com/english/advisories/2007/3868
http://www.us-cert.gov/cas/techalerts/TA07-319A.html
http://www.securityfocus.com/bid/26444
http://www.kb.cert.org/vuls/id/498105
http://securitytracker.com/id?1018950
http://secunia.com/advisories/27643
http://lists.apple.com/archives/security-announce/2007/Nov/msg00002.html