Microsoft Scrambles To Patch ShieldBreak Zero-Day Flaw In Windows Defender:
The Nightmare-Eclipse and Microsoft saga continues with another major Windows ...
hothardware.com/news/microsoft-scrambles-to-patch-shieldbreak-zero-day-flaw-in-windows-defender
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software, data or commands that use a bug or vulnerability to compromise a computer system
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New Windows Defender zero-day blocks Microsoft antivirus updates: Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) ...
bleepingcomputer.com/news/security/new-windows-defender-zero-day-blocks-microsoft-antivirus-updates/
New Microsoft Defender 'ShieldCrash' zero-day grants SYSTEM access: An anonymous security researcher known as Nightmare Eclipse has released a new ...
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Shield Crash: Researcher annoys Microsoft with new Defender exploit - | Golem.de: Microsoft's "high-quality update" against the Shieldbreak exploit is ...
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Microsoft working on Defender patch for ShieldBreak zero-day: Microsoft is working on a security patch for the "ShieldBreak" zero-day vulnerability ...
bleepingcomputer.com/news/security/microsoft-working-on-defender-patch-for-shieldbreak-zero-day/
"High-quality update" is coming: Microsoft reacts to Defender exploit Shieldbreak - | Golem.de
golem.de/news/high-quality-update-kommt-microsoft-reagiert-auf-defender-exploit-shieldbreak-2608-211996.html
Disgruntled security researcher just dropped another Windows zero-day, right on schedule
techspot.com/news/113477-disgruntled-security-researcher-dropped-another-windows-zero-day.html
Microsoft's nemesis drops new zero-day privilege escalation vulnerability — attack grants system-level privileges, but it could already be patched
tomshardware.com/tech-industry/cyber-security/microsofts-nemesis-drops-new-zero-day-privilege-escalation-vulnerability-attack-grants-system-level-privileges-but-it-could-already-be-patched
NightmareEclipse strikes again at Windows 11 exploit with ShieldBreak proof of concept
neowin.net/news/nightmareeclipse-strikes-again-at-windows-11-exploit-with-shieldbreak-proof-of-concept/
New Microsoft Defender update can let hackers totally fill your Windows 11 PC disk space
neowin.net/news/new-microsoft-defender-update-can-let-hackers-totally-fill-your-windows-11-pc-disk-space/
Key FactsMicrosoft Defender Patch Triggers Extreme Disk Usage
Jul 14, 2026 · Reading time: ~30 sec.
Summary created with AI assistance · Source: neowin.net
Summary created with AI assistance · Source: neowin.net
- A recent update to Microsoft Defender's Malware Protection Engine fixes a privilege escalation flaw but can cause full disk exhaustion.
- The issue arises because cached Zone.Identifier alternate data streams lack enforced size limits, enabling excessive disk consumption.
- Attackers exploit a malicious SMB server to deliver oversized files that Defender caches indefinitely, leading to disk space depletion.
- This vulnerability is confirmed on Windows 11 25H2 and Windows Server 2025, with ongoing research into potential WebDAV exploitation.
Microsoft patches RoguePlanet Defender zero-day vulnerability: Microsoft has released a security patch to address a Defender zero-day vulnerability known as ...
bleepingcomputer.com/news/microsoft/microsoft-patches-rogueplanet-defender-zero-day-vulnerability/
Update against Rogueplanet: Microsoft reacts to dangerous Defender exploit - | Golem.de
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Dangerous Windows exploit: Microsoft promises a "high-quality update" - | Golem.de
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"Race" continues: Microsoft is working on a fix for the zero-day vulnerability: Microsoft is working on a security patch for a zero-day vulnerability in ...
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Nightmare-Eclipse Drops Another BitLocker Bypass After YellowKey Patch: Nightmare-Eclipse, the current bane of Microsoft's existence, strike again with new ...
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Microsoft's bug-hunting nemesis extends vendetta with more zero-day attacks — Nightmare Eclipse publishes RoguePlanet and GreatXML local privilege ...
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dlvr.it Jun 10
Nightmare Eclipse publishes new Windows Defender zero-day: Revenge is a dish best served code
theregister.com/security/2026/06/10/nightmare-eclipse-publishes-new-windows-defender-zero-day/5253725
RoguePlanet: Nightmare Eclipse shows zero day in Microsoft Defender: The security researcher behind the pseudonym "Nightmare Eclipse" is causing a stir with the ...
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New Microsoft Defender “RedSun” zero-day PoC grants SYSTEM privileges: A researcher known as "Chaotic Eclipse" has published a proof-of-concept exploit ...
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secpod.com Feb 12
Microsoft’s February 2026 Patch Tuesday: Six Zero-Days, 58 flaws Patched Amid Growing Exploit Activity
secpod.com/blog/microsofts-february-2026-patch-tuesday-six-zero-days-patched-amid-growing-exploit-activity/
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