Ruby on Rails 3.x < 3.2.16 and 4.x < 4.0.2 - Denial of Service via Invalid MIME Type Header
actionpack/lib/action_view/lookup_context.rb in Action View in Ruby on Rails 3.x before 3.2.16 and 4.x before 4.0.2 allows remote attackers to cause a denial of service (memory consumption) via a header containing an invalid MIME type that leads to excessive caching.