Format string vulnerability in (1) Bahamut IRCd 1.4.35 and earlier and other IRC daemons based on Bahamut including (2) digatech 1.2.1 (3) methane 0.1.1 (4) AndromedeIRCd 1.2.3-Release and (5) ircd-RU when running in debug mode allows remote attackers to cause a denial of service and possibly execute arbitrary code via a request containing format strings.