Cyber Risks · Krebs on Security

Patch Tuesday, May 2026 Edition

Summary: Microsoft's May 2026 Patch Tuesday addressed at least 118 security vulnerabilities, 16 of them rated critical, and marked the first Patch Tuesday in nearly two years with no emergency zero-day fixes. The volume comes as vendors including Apple, Google, Mozilla and Oracle fix near-record numbers of bugs, with Mozilla's Firefox 150 resolving 271 vulnerabilities reportedly found during Anthropic's Project Glasswing evaluation and Google's Chrome fixing 127 flaws on May 8.

Bottom line: Microsoft fixed 167 flaws in April and 118 this month, while Oracle's latest quarterly update addressed at least 450 flaws including more than 300 remotely exploitable, unauthenticated ones - a patch load that strains any team's ability to test and deploy before attackers work from the same disclosures.

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Topics
Vulnerabilities & Patching
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