Microsoft ships largest Patch Tuesday on record, with one bug under active attack

Microsoft ships largest Patch Tuesday on record, with one bug under active attack
Microsoft released fixes for more than 200 security flaws in its largest Patch Tuesday ever, as AI-driven vulnerability discovery accelerates the pace of disclosures. The update includes a critical wormable Windows flaw, an actively exploited Microsoft Defender bug, and a BitLocker bypass tied to the researcher known as Nightmare Eclipse. #Microsoft #PatchTuesday #Windows #MicrosoftDefender #BitLocker #NightmareEclipse #CVE-2026-45657 #CVE-2026-41091 #CVE-2026-50507

Keypoints

  • Microsoft issued fixes for 206 CVEs in its June Patch Tuesday release.
  • Trend Micro ZDI said it was the largest monthly Microsoft release ever recorded.
  • AI tools are driving a surge in vulnerability discovery, according to Microsoft.
  • CVE-2026-45657 is a severe wormable Windows flaw that could spread across networks.
  • CVE-2026-41091 and CVE-2026-50507 involve Microsoft Defender and BitLocker, with links to actively exploited and publicly disclosed issues.

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