CVE 2010-1404
Use-after-free vulnerability in WebKit in Apple Safari before 5.0 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1 on Mac OS X 10.4, allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via an SVG document that contains recursive Use elements, which are not properly handled during page deconstruction.
See the 
CVE page on Mitre.org
for more details.
