GNOME Evolution 2.4.2.1 and earlier allows remote attackers to cause a denial of service (CPU and memory consumption) via a text e-mail with a large number of URLs, possibly due to unknown problems in gtkhtml.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25050
http://www.vupen.com/english/advisories/2006/0801
http://www.securityfocus.com/bid/16899
http://www.securityfocus.com/archive/1/426452/100/0/threaded