Apple today released Safari 5.0.5 and Security Update 2011-002 for Mac OS X. Though both updates bring minor security patches to Snow Leopard, versions for Mac OS X v10.5 Leopard incorporate significantly more changes. The document describing the security content changes of Safari 5.0.5 states the following:
Impact: Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution
Description: An integer overflow issue existed in the handling of nodesets. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution.
Apple has yet to release a document summarizing the updates included in Security Update 2011-002, but recommends it for all Snow Leopard and Leopard users. Once a support document outlining security changes is released, it should appear on this page.
Both updates can be acquired by running Software Update or via direct download. Small Dog recommends running a full Time Machine backup prior to installing system updates.