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Mozilla Used Anthropic’s Mythos to Find and Fix 271 Bugs in Firefox

ID: 3f31604c-50fc-5853-8b8e-771f67640c70

STIX ID: report--3f31604c-50fc-5853-8b8e-771f67640c70

Feed Name: WIRED Security

Threat Score
20/100

Date Published: 2026-04-21

Date Updated: 2026-04-26

Author: Lily Hay Newman

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Mozilla says Firefox 150 includes protections for 271 vulnerabilities discovered using early access to Anthropic's Mythos Preview and warns that advanced AI models are dramatically changing vulnerability hunting—both for defenders and potential attackers—forcing software projects to undergo a broad remediation effort.

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