It was found that when Artemis and HornetQ before 2.4.0 are configured with UDP discovery and JGroups discovery a huge byte array is created when receiving an unexpected multicast message. This may result in a heap memory exhaustion, full GC, or OutOfMemoryError.
https://access.redhat.com/errata/RHSA-2018:0268
https://access.redhat.com/errata/RHSA-2018:0269
https://access.redhat.com/errata/RHSA-2018:0270
https://access.redhat.com/errata/RHSA-2018:0271
https://access.redhat.com/errata/RHSA-2018:0275
https://access.redhat.com/errata/RHSA-2018:0478
https://access.redhat.com/errata/RHSA-2018:0479
https://access.redhat.com/errata/RHSA-2018:0480
https://access.redhat.com/errata/RHSA-2018:0481