Rails 3.0.12 has been released!

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:

• require and load will return the value from the superclass
• ActiveModel confirmation validation fixes
• Increasing rack dependency

For a comprehensive list, see the commits on github.

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Source: http://weblog.rubyonrails.org/