Microsoft has fixed the RoguePlanet zero-day in Defender via an update to the Malware Protection Engine. The patch closes the latest vulnerability publicly disclosed by researcher Nightmare Eclipse, who has sparred with the company over its handling of bug reports all year.
Microsoft addressed the bug outside its regular Patch Tuesday cycle.
RoguePlanet marks the seventh zero-day publicly disclosed by Nightmare Eclipse since April.
The quiet engine update rather than a Patch Tuesday release suggests Microsoft treated the race condition as a targeted Defender fix, though the lack of technical detail leaves defenders without clear guidance on detection or mitigation steps.
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