WebKit in Apple Safari before 6.0 accesses uninitialized memory locations during the rendering of SVG images, which allows remote attackers to obtain sensitive information from process memory via a crafted web site.
http://www.securityfocus.com/bid/54703
http://support.apple.com/kb/HT5503
http://support.apple.com/kb/HT5400
http://lists.apple.com/archives/security-announce/2012/Sep/msg00003.html
http://lists.apple.com/archives/security-announce/2012/Jul/msg00000.html