Heap-based buffer overflow in the parse_packet function in network.c in collectd before 5.4.3 and 5.x before 5.5.2 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via a crafted network packet.
https://github.com/collectd/collectd/commit/b589096f907052b3a4da2b9ccc9b0e2e888dfc18