http://www.whitedust.net/speaks/837/
Saw some reports about that a few days ago, looks like the effects are more far-reaching than originally predicted.
Everything about this I've seen (on mailing lists, ISS's X-force, etc.) indicate that it's a DoS attack, not arbitrary code. :-/
But anyways, I updated it a couple days ago. I updated everything I felt comfortable with. :)
Incidentally, SharpZipLib, being a C# port of zlib, is not affected by this problem.
Who here posts and reads BugTraq often? I don't.