Apple has released iOS 4.3.4 for iPad, iPod touch, and GSM /AT&T iPhone 4 and iPhone 3GS, and iOS 4.2.9 for Verizon iPhone, which addresses the dangerous PDF security exploit utilized by Jailbreakme.com.
Plug into iTunes and check for updates to get it. As always, if you're Jailbroken already, stay away or you'll lose your Jailbreak.
[Thanks to @brandon_m70 for the head's up]
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