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Security fixes for three Qt versions

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Trolltech has announced that it has released three new versions of Qt (3.3.7, 4.1.5 and 4.2.1) featuring security fixes over their predecessors. The security flaw involves the processing of bitmapped images, which can be triggered by transforming specially prepared bitmaps from untrusted sources. A patch is supposedly available, but I can't find it; the sources can be downloaded from the Qt download page.