On the heels of more problems with browser plug-ins such as Java and Flash, a newly-discovered flaw in HTML5 -- used throughout the web and a fundamental part of all modern browsers -- can be used maliciously to fill hard drives to capacity with junk data. The exploit can be demonstrated on a website set up to document the flaw, called Filldisk. All browsers are susceptible to it -- though Mozilla's Firefox features a hard cap of 5MB of such data and thus mitigates the effect, while some older 32-bit browsers may crash rather than fill up the drive.
