Multiple format string vulnerabilities in AppleScript in Apple Mac OS X before 10.6.7 allow context-dependent attackers to execute arbitrary code or cause a denial of service (application crash) via format string specifiers in a (1) display dialog or (2) display alert command in a dialog in an AppleScript Studio application.
http://support.apple.com/kb/HT4581
http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html