http://www.frsirt.com/english/advisories/2006/2671
From the advisory:
A vulnerability has been identified in Apple Safari, which could be exploited by attackers to cause a denial of service. This flaw is due to a NULL pointer dereference error when handling a specially crafted DHTML "setAttributeNode()" method, which could be exploited by attackers to crash a vulnerable browser by tricking a user into visiting a malicious web page.
Advisory states version 2.0.4 (419.3) and earlier as affected.
Antony and others, is this the newest available (probably yes).
J-M: edited to fix two typos.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.0; fi; rv:1.8.0.4) Gecko/20060508 Firefox/1.5.0.4


