CVE 2009-1701
Use-after-free vulnerability in the JavaScript DOM implementation in WebKit in Apple Safari before 4.0, iPhone OS 1.0 through 2.2.1, and iPhone OS for iPod touch 1.1 through 2.2.1 allows remote attackers to execute arbitrary code or cause a denial of service (application crash) by destroying a document.body element that has an unspecified XML container with elements that support the dir attribute.
See the 
CVE page on Mitre.org
for more details.
