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Microsoft Defender update causes crashes and exposes a confirmed flaw

A bad Microsoft Defender update is reportedly causing crashes and breaking scans on PCs. Microsoft has also confirmed a Defender flaw known as ShieldBreak.

By DoomRadar · Published on DoomRadar .

Why it matters

The issue could disrupt security scanning and affect the protection of users relying on Microsoft Defender.

Related source links

These links were collected with this event. Recorded source dates may reflect when a link was found. Article publication dates are shown only when available from the source. Open the originals for their full context.

  1. Microsoft Confirms ShieldBreak Defender Flaw ↗esecurityplanet.com · Recorded source date: Aug 18, 2026, 9:46 PM UTC
  2. Is Microsoft Defender crashing on your PC? A bad update is breaking scans ↗windowscentral.com · Recorded source date: Aug 19, 2026, 6:46 PM UTC

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Connected by topic or specific details. Dates below are publication dates; the articles may describe separate events.

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