Secunia

A vulnerability has been reported in Opera, which can be exploited by malicious people to compromise a user's system

The vulnerability is caused due to Opera using already freed memory when parsing BitTorrent headers and can lead to an invalid object pointer being dereferenced. This can be exploited to execute arbitrary code, when the user is tricked into clicking on a specially crafted BitTorrent file and then removes it via a right-click from the download pane.

The vulnerability is reported in version 9.21 on Windows. Other versions may also be affected.

Solution
Update to version 9.22.

Provided and/or discovered by
Discovered by enhalos and reported via iDefense Labs.

Changelog
Further details available in Customer Area

Original Advisory
Opera:
http://www.opera.com/docs/changelogs/windows/922/

iDefense:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=564

Deep Links
Links available in Customer Area