Apple has released a security update today called Security Update 2004-08-09. The sparse release notes say that the file updates libpng (Portable Network Graphics). Those release notes:
Security Update 2004-08-09 delivers a number of security enhancements and is recommended for all Macintosh users. This update includes the following components:
- libpng (Portable Network Graphics)
Apple is providing a link to a KBase article on security updates, but as of this writing, that article has no information on Security Update 2004-08-09.
In addition to this security update, Apple released Mac OS X 10.3.5. TMO has confirmed that the update includes this security patch. You can download the update through Software Update Control Panel, and the download weighs in at 1 MB. Some readers have reported that the update is not available once you install 10.3.5.