Opera has dashed off a security fix for Windows users which plugs a critical hole in the browser that allowed attackers hijack Windows machines by feeding them a malicious torrent file. According to a [security advisory][1] on the Opera site, "a specially crafted torrent file can cause a buffer overflow in Opera. This allows arbitrary code to be injected and executed." The exploit was only possible if users right-clicked on a malicious torrent in the transfer manager. Clicking a torrent link itself would not tricker the flaw. Opera patched the flaw in a [security update][2] (version 9.21), which is a recommended download for all Windows Opera users. [1]: http://www.opera.com/support/search/view/860/ "Advisory: Malicious torrent files can execute arbitrary code in Opera" [2]: http://www.opera.com/download/index.dml?opsys=Windows&lng=en&ver=9.21&platform=Windows&local=y "Download Opera 9.21"