Apple released four security updates yesterday via OS X’s Automatic Update, relating to security flaws in the company’s iChat and OS X software. Some security researchers had identified these flaws as being “highly critical” and advise OS X users to update their machines immediately. The bugs, which were exposed during the Month of Apple Bugs, have been credited as such in the security bulletin.

For more on the patches:
– see this eWeek article
– or the technical breakdown of the vulnerabilities at Ars Technica