The host is installed with Apple Safari before 4.0.4 is prone to use-after-free vulnerability. The flaw is present in the application which fails to properly handle libxml 2 2.5.10, 2.6.16, 2.6.26, 2.6.27, and 2.6.32, and libxml 1.8.17 via crafted notation or enumeration attribute types in an XML file. Successful exploitation allows attacker to cause a denial of service.