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Jeez, Microsoft:

'Computer security experts were grappling with the threat of a new weakness in Microsoft s Windows operating system that could put hundreds of millions of PCs at risk of infection by spyware or viruses.

The potential [security threat] is huge, said Mikko Hypp nen, chief research officer at F-Secure, an antivirus company. It s probably bigger than for any other vulnerability we ve seen. Any version of Windows is vulnerable right now. '

The vulnerabilty appears to be yet another exploit involving running malicious codes through images. Didn't you guys just supposedly fix this?

(Update: Nicholas Weaver posted a link in our Comments section directing us to instruction to an unofficial patch, along with the portent: "It really is that serious." Microsoft's patch? Due on January 10th.)