CVE-2019-17513: Ratpack Project Ratpack

High severity, CVSS 7.5. EPSS: 2.2% chance of exploitation in the next 30 days.

An issue was discovered in Ratpack before 1.7.5. Due to a misuse of the Netty library class DefaultHttpHeaders, there is no validation that headers lack HTTP control characters. Thus, if untrusted data is used to construct HTTP headers with Ratpack, HTTP Response Splitting can occur.

Affected products

• Ratpack Project Ratpack: before 1.7.5 (fixed in 1.7.5)

Published 2019-10-18. Last modified 2026-06-17.