Microsoft has put out a patch for the unreleased Vista OS to cover the same graphics-rendering problem that dogged Windows earlier this month.

The patch applies to a Community Technology Preview (CTP) of Vista released in December, available to developer subscribers and beta testers. Vista isn't due for a general release to the public until later this year.

The fix amends how Windows Vista deals with graphics in the WMF (Windows Metafile) format, as those files could force a machine to run arbitrary code. If opened, WMF files could allow code to execute and download more malicious software.

After the WMF vulnerability came to light last month, it caused an unorthodox response given the danger security experts felt it posed. One researcher created an unofficial patch, which some security companies advised users to apply immediately.
Meanwhile, Microsoft broke with its regular patch schedule and issued a fix.