In Undertow before versions 7.1.2.CR1, 7.1.2.GA it was found that the fix for CVE-2016-4993 was incomplete and Undertow web server is vulnerable to the injection of arbitrary HTTP headers, and also response splitting, due to insufficient sanitization and validation of user input before the input is used as part of an HTTP header value.
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1067
https://access.redhat.com/errata/RHSA-2019:0877
https://access.redhat.com/errata/RHSA-2018:2643
https://access.redhat.com/errata/RHSA-2018:1251
https://access.redhat.com/errata/RHSA-2018:1249