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.
Exploitability
AV:NAC:HPR:NUI:NScope
S:UImpact
C:HI:HA:N7.4/CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N