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Microsoft fixes known issue causing Windows Defender crashes

August 19, 2026 · BleepingComputer · Severity: MEDIUM

Microsoft has resolved a bug that caused Windows Defender to crash after a recent security update, resulting in 0xc0000005 access violation errors on some affected systems.

Key Takeaways

  • Microsoft resolved a known bug that caused Windows Defender to crash after a recent security update was installed.
  • The crashes manifested as 0xc0000005 access violation errors on affected Windows systems running the updated Defender version.
  • Users should ensure their systems have the latest Windows Defender and Windows Update patches installed to prevent the crash issue.
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