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.
Weaknesses in this category are related to improper management of system resources.