Apple today released Safari 7.0.4 for OS X Mavericks and Safari 6.1.4 for OS X Mountain Lion and Lion, addressing a significant memory corruption issue in the WebKit engine powering Apple's browser. It also addresses an issue with handling of unicode characters that could be exploited.

The Safari 7.0.4 update is recommended for all OS X Mavericks users and contains improvements to security. For detailed information on the security content of this update, please visit:

http://support.apple.com/kb/HT1222

The new update comes roughly six weeks after the release of Safari 7.0.3, which included a more substantial list of improvements. Safari 7.0.3 was later bundled into OS X 10.9.3, which was released last week.

Safari 7.0.4 and 6.1.4 are free downloads available through the Software Update mechanism in the Mac App Store.