Two vulnerabilities were found in hexchat 2.11.0 and before.
Directory traversal vulnerability in the client in HexChat 2.11.0 allows remote IRC servers to read or modify arbitrary files via a .. (dot dot) in the server name.
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.
Created hexchat tracking bugs for this issue:
Affects: epel-6 [bug 1414690]
For the record:
CVE-2016-2087 is fixed since 2.12.2
CVE-2016-2233 is fixed since 2.12.0