Dangling pointer vulnerability in nsPluginArray — Mozilla

Security researcher regenrecht reported via TippingPoint’s Zero Day Initiative an error in the implementation of the window.navigator.plugins object. When a page reloads, the plugins array would reallocate all of its members without checking for existing references to each member. This could result in the deletion of objects for which valid pointers still exist. An attacker could use this vulnerability to crash a victim’s browser and run arbitrary code on the victim’s machine.