Multiple use-after-free vulnerabilities in WebKit, as used in Apple
Safari before 4.1.3 and 5.0.x before 5.0.3, Google Chrome before
5.0.375.127, and webkitgtk before 1.2.6, allow remote attackers to
execute arbitrary code or cause a denial of service (application
crash) via vectors related to improper handling of MIME types by
plug-ins.