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Ars Technica

Patch for Windows Defender 0-day could allow attackers to fill hard disk

Thursday, July 9, 2026


NightmareEclipse reported a vulnerability in Windows Defender that could allow attackers to fill a hard disk. Microsoft released a patch to address the issue. The researcher disclosed the flaw as a zero-day vulnerability prior to a public fix being available.

Original reporting: https://arstechnica.com/security/2026/07/patch-for-windows-defender-0-day-could-allow-attackers-to-fill-hard-disk/

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