In Wireshark 2.6.0 to 2.6.1 and 2.4.0 to 2.4.7, the CoAP protocol dissector could crash. This was addressed in epan/dissectors/packet-coap.c by properly checking for a NULL condition.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 54.5%