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.
The unsigned integer underflow sounds like one of those edge-case bugs that could still cause real instability if exploited properly. Hopefully the EPEL package gets patched quickly before it spreads wider into production environments. Keeping ModSecurity updated is definitely worth it here https://tichop.com/item/small-titanium-cutting-board-dual-sided-106/.