CVE-2016-0751: Rubyonrails Rails

High severity, CVSS 7.5. EPSS: 9.7% chance of exploitation in the next 30 days.

actionpack/lib/action_dispatch/http/mime_type.rb in Action Pack in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, 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.

Affected products

• Rubyonrails Rails: version 4.0.0 only; version 4.0.1 only; version 4.0.2 only; version 4.0.3 only; version 4.0.4 only; version 4.0.5 only; …
• Rubyonrails Ruby On Rails: up to and including 3.2.22; version 4.0.10 only; version 4.0.11 only; version 4.0.11.1 only; version 4.0.12 only; version 4.0.13 only; …

Published 2016-02-16. Last modified 2026-06-17.