CVE-2011-3187: Rubyonrails Rails

Medium severity, CVSS 4.3. EPSS: 6.7% chance of exploitation in the next 30 days.

The to_s method in actionpack/lib/action_dispatch/middleware/remote_ip.rb in Ruby on Rails 3.0.5 does not validate the X-Forwarded-For header in requests from IP addresses on a Class C network, which might allow remote attackers to inject arbitrary text into log files or bypass intended address parsing via a crafted header.

Affected products

• Rubyonrails Rails: version 3.0.5 only

Published 2011-08-29. Last modified 2026-06-16.