SpamAssassin provides a way to reduce unsolicited commercial email (spam) from incoming email.
A flaw was found in the way SpamAssassin processes HTML email containing URIs. A carefully crafted mail message could cause SpamAssassin to consume significant resources. If a number of these messages are sent, this could lead to a denial of service, potentially delaying or preventing the delivery of email. (CVE-2007-0451)
Users of SpamAssassin should upgrade to these updated packages which contain version 3.1.8 which is not vulnerable to these issues.