Rails 3.0.12 has been released. This release contains various bug fixes and two important security fixes. All users are recommended to upgrade as soon as possible.
CHANGES
For information regarding the possible vulnerabilities, please see the announcements here and here.
Some highlights from this release are:
requireandloadwill return the value from the superclassActiveModel confirmation validation fixes
Increasing rack dependency
For a comprehensive list, see the commits on github.