Opera users everywhere should check the Opera site for updates, as the company has announced that a new version is available to patch what they call an "extremely severe" vulnerability. The update that was released yesterday, covers more than a half dozen security flaws, though only one of those seems severe enough to warranty this rushed release. Apparently all three major platforms are affected. Three of the flaws can result in arbitrary code execution, which you can read about in the version change logs.
You can download the new version, 9.63, whether you are using Windows, Linux or Mac OS X right away. There's no feature enrichment for this release, obviously, but it's still an important update for anyone who makes use of the browser.