CVE-2025-27111: Rack

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Rack is a modular Ruby web server interface. The Rack::Sendfile middleware logs unsanitised header values from the X-Sendfile-Type header. An attacker can exploit this by injecting escape sequences (such as newline characters) into the header, resulting in log injection. This vulnerability is fixed in 2.2.12, 3.0.13, and 3.1.11.

Affected products

• Rack Rack: before 2.2.12 (fixed in 2.2.12); from 3.0.0, before 3.0.13 (fixed in 3.0.13); from 3.1.0, before 3.1.11 (fixed in 3.1.11)

Published 2025-03-04. Last modified 2026-06-17.