It was discovered that Undertow before 1.4.17, 1.3.31 and 2.0.0 processes http request headers with unusual whitespaces which can cause possible http request smuggling.
{ "ubuntu_priority": "medium" }
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "2.0.23-1", "binary_name": "libundertow-java" }, { "binary_version": "2.0.23-1", "binary_name": "libundertow-java-doc" } ] }