Apple has issued two security updates, one for the iPhone, the other for its Safari 3 public beta.
The Safari 3 Beta Update 3.0.3 is available through Software Update or from Apple's website.
Apple says the update makes the browser more stable.
The release also addresses a number of issues found on Mac or Windows installations of the company's browser. It prevents some forms of web spoofing, code execution and other potentially security flaws.
The iPhone 1.0.1 update implements a similar set of security patches on the Safari browser carried within Apple's handheld device.
The iPhone security patch is only available through iTunes - it doesn't appear on a computer's software update mechanism and isn't being distributed from Apple's website.
iTunes automatically checks Apple's update server on its weekly schedule. When an update is detected, it will download it. "We recommend installing the update immediately," Apple said.