Apple has released updates covering multiple vulnerabilities of varying severity. Affected Systems:
. Apple Mac OS X version 10.3.x and 10.4.x
. Apple Mac OS X Server version 10.3.x and 10.4.x
"Both PowerPC and Intel-based Apple systems are affected... the most serious of these vulnerabilities allows remote attackers to execute arbitrary code. Attackers may take advantage of the less-serious vulnerabilities to bypass security restrictions or cause a denial of service."
Anyhow, if you're a Mac user, be sure to download the fixes. I'd expect more, too, as long as Mac keeps running those irritating "I'm a Mac and I'm a PC" ads. I'm sure that hackers see that as a challenge.
EDIT: Turns out people really love their Macs. Just wanted to let everyone know that I don't hate Macs. I think they're just as viable as any other computer. I just hate those stoopid "I'm a Mac and I'm a PC" ads.