More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2322460 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
According to the GitHub advisory, this affects waitress >=2.0.0 and <3.0.1. https://github.com/Pylons/waitress/security/advisories/GHSA-9298-4cf8-g4wj EPEL 8 has python-waitress-1.4.3-1.el8, and thus is not affected.