Security researcher Abdelhamid Naceri, known as NightmareEclipse, released a new zero-day exploit called BigDiskBuster that prevents Microsoft Defender from installing security updates while leaving the antivirus running. The vulnerability was disclosed over the weekend of September 22, 2026.
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Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates. [...]
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Security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) has released another Microsoft Defender zero-day exploit that blocks antivirus updates. https://www. bleepingcomputer.com/news/secu rity/new-windows-defender-zero-day-blocks-microsoft-antivirus-updates/
New Windows Defender zero-day blocks Microsoft antivirus updates https://www. bleepingcomputer.com/news/secu rity/new-windows-defender-zero-day-blocks-microsoft-antivirus-updates/
BigDiskBuster leaves Microsoft's antivirus running but unable to install updates
🖲️ #Noticia #CiberSeguridad #Cybersecurity #CiberNoticia Researcher Drops BigDiskBuster Zero-Day PoC That Blocks Microsoft Defender Updates Leer Más / Read More... Haz clic para acceder al contenido completo.
Researcher NightmareEclipse has disclosed BigDiskBuster, a zero-day that blocks Microsoft Defender updates by filling disk space. No patch available. https:// deafnews.it/en/article/bigdisk buster-the-zero-day-that-leaves-microsoft-defender-stuck-on-stale-definitions # Cybersecurity
NightmareEclipse's latest zero-day leaves Microsoft Defender stuck in the past https://www. theregister.com/security/2026/ 09/22/nightmareeclipses-latest-zero-day-leaves-microsoft-defender-stuck-in-the-past/5298320