Kadu 0.4.3 allows remote attackers to cause a denial of service (application crash) via a large number of image send requests.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24720
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-0774
http://www.vupen.com/english/advisories/2006/0609
http://www.securityfocus.com/archive/1/425134/100/0/threaded
http://www.piotrbania.com/all/adv/kadu-fun.txt