CVE-2008-5189: CRLF injection vulnerability in Ruby on Rails before 2.0.5 allows remote attackers to inject arbitrary HTTP...

Security readout for executives and security teams

CVE-2008-5189 is an old Ruby on Rails redirect flaw. A crafted URL passed to redirect_to could let an attacker add unintended HTTP headers, enabling HTTP response splitting. Business urgency is mainly for legacy Rails applications that still run versions before 2.0.5. Exposure is likely limited to legacy Ruby on Rails applications running versions before 2.0.5, especially where redirect_to receives user-influenced URLs. Modern Rails deployments are unlikely to be affected unless they retain vulnerable framework code. Treat this as a legacy-technology exposure issue. It is not supported by active exploitation evidence in the bundle, but vulnerable public Rails applications should be remediated promptly because response splitting can undermine user trust and intermediary controls. Mitigation focus: Identify applications running Ruby on Rails earlier than 2.0.5.; Upgrade affected applications to Rails 2.0.5 or later, following Rails and distribution guidance.; Review redirect_to calls that use request-controlled values..

Prepared

Jun 28, 2026, 11:41 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.