CVE-2012-6109: Rack Project Rack

Medium severity, CVSS 4.3. EPSS: 2.7% chance of exploitation in the next 30 days.

lib/rack/multipart.rb in Rack before 1.1.4, 1.2.x before 1.2.6, 1.3.x before 1.3.7, and 1.4.x before 1.4.2 uses an incorrect regular expression, which allows remote attackers to cause a denial of service (infinite loop) via a crafted Content-Disposion header.

Affected products

• Rack Project Rack: up to and including 1.1.3; version 0.1 only; version 0.2 only; version 0.3 only; version 0.4 only; version 0.9 only; …

Published 2013-03-01. Last modified 2026-06-16.