WebKit, as used in Apple Safari before 5.0.6, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site, a different vulnerability than other WebKit CVEs listed in APPLE-SA-2011-07-20-1.
Apple Security Advisory 2011-10-11-1 - iTunes 10.5 has been released and addresses CoreFoundation, ColorSync, CoreAudio, CoreMedia, ImageIO, WebKit, and various other vulnerabilities.