Ubuntu Security Notice 3166-1 - A large number of security issues were discovered in the WebKitGTK+ Web and JavaScript engines. If a user were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary code execution.
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Apple Security Advisory 2016-10-24-3 - Safari 10.0.1 is now available and addresses code execution vulnerabilities.
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