IRC client irssi in irssi-text before 0.8.4 allows remote attackers to cause a denial of service (crash) via an IRC channel that has a long topic followed by a certain string, possibly triggering a buffer overflow.
https://exchange.xforce.ibmcloud.com/vulnerabilities/9395
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-0972