Possible Object Leak and Denial of Service attack in Action Pack
actionpack/lib/action_dispatch/http/mime_type.rb in Action Pack in Ruby on Rails before 22.214.171.124, 4.0.x and 4.1.x before 126.96.36.199, 4.2.x before 188.8.131.52, and 5.x before 5.0.0.beta1.1 does not properly restrict use of the MIME type cache, which allows remote attackers to cause a denial of service (memory consumption) via a crafted HTTP Accept header.
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The constraints below list the versions that this vulnerability is patched in, and versions that are unaffected. If a patch is ready but unrealeased, then it is pending.
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Affected package information