Apple released Safari 7.0.6 for OS X Mavericks and Safari 6.1.6 for OS X Lion and Mountain Lion on Wednesday to patch several WebKit-related security and memory corruption issues that could let attackers run arbitrary code on victim's computers. The security issue could also cause app crashes.
Apple patches Safari security flaws for OS X Lion, Mountain Lion and Mavericks
According to Apple's security release notes, seven security issues were patches, all related to WebKit memory corruption. The notes state, "These issues were addressed through improved memory handling."
While Apple released Safari updates for Lion, Mountain Lion, and Mavericks, Snow Leopard didn't get any attention because the company no longer supports the that version of the operation system. Snow Leopard, or OS X 10.6, was released in August 2009 and saw its last update to 10.6.8 three years ago. OS X 10.7, or Lion, replaced Snow Leopard in 2011.
The Safari update is available as a free download through the Software Update app on your Mac. You can find it by choosing Apple Menu > Software Update.