Apple yesterday released a pair of QuickTime 7.7 updates for Mac OS X Leopard and Windows XP/Vista/7 users. According to an associated support document, the updates bring fixes for fourteen separate issues related to security.
QuickTime 7.7 improves security and is recommended for all Mac OS X Leopard users.
For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222.
The update weighs in at 68.85 MB for Mac OS X Leopard and 37.15 MB for Windows.