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Mozilla Fixes 271 Firefox Bugs Using Anthropic’s Mythos AI

ID: 516a31ac-bdee-570c-a93a-e6a5163881da

STIX ID: report--516a31ac-bdee-570c-a93a-e6a5163881da

Feed Name: TechRepublic Security

Threat Score
30/100

Date Published: 2026-04-22

Date Updated: 2026-04-23

Author: Aminu Abdullahi

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Mozilla used Anthropic’s Claude Mythos Preview to find and patch 271 security vulnerabilities in Firefox 150; the company says Mythos found bugs at a level comparable to elite human researchers, there is no evidence of exploitation, and the defects represent known vulnerability types rather than a new category.

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