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Windows Defender Has a Dangerous Zero-Day Bug — And the Fix Has Its Own Problem
Ars Technica·Friday, 10 July 2026
A patch has been released for a Windows Defender zero-day vulnerability that could allow attackers to fill a victim's hard disk, potentially crashing their system. The article notes an ongoing feud between a researcher named NightmareEclipse and Microsoft, with no signs of resolution.
Why It Matters
Windows Defender is the default antivirus for most Windows users worldwide, meaning this vulnerability could affect a massive number of people who have never changed their security settings.
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