WebKit before r53525, as used in Google Chrome before 4.0.249.89, allows remote attackers to execute arbitrary code in the Chrome sandbox via a malformed RUBY element, as demonstrated by a <ruby>><table><rt> sequence.
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.