A colon is now allowed in a username/password combination for basic auth per RFC 2617. If authenticating with a cert that has a colon in the DN things end up breaking. See https://bugzilla.redhat.com/show_bug.cgi?id=1027442 for many more gory details.
The plan for this is to fix it by disallowing colon in a DN for now, like mod_ssl in RHEL 6, see patch in https://bugzilla.redhat.com/show_bug.cgi?id=1027442#c26
We may eventually make this more flexible.
master: 184804c82daf7fe04dfb0b0ecdc3e06be0c103c1
Metadata Update from @rcritten: - Issue set to the milestone: mod_nss-1.0.13