Stack-based buffer overflow in the inbound_cap_ls function in common/inbound.c in HexChat 2.10.2 allows remote IRC servers to cause a denial of service (crash) via a large number of options in a CAP LS message.
https://github.com/fath0218/CVE-2016-2233
https://www.exploit-db.com/exploits/39657/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-3317