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Mozilla Says Anthropic’s Mythos AI Found High-Severity Firefox Bugs Hidden For Years

Mozilla researchers said Anthropic’s Mythos AI model has uncovered numerous high-severity vulnerabilities in the Firefox browser, including flaws that had remained undetected in the software for more than a decade. The findings provide one of the clearest public examples so far of how advanced AI systems are changing software security and vulnerability research. Anthropic introduced the Mythos model in April and said at the time that the system …
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The AI sees it all. Mozilla reveals how the Anthropic model has transformed the security of its browser. It has done so by detecting "impossible" failures and firing 1,200% of the volume of monthly patches. The famous "bug bounty" that encouraged human experts to detect new failures and rewarded them with succulent economic awards could no longer make sense of the use of herramietnas such as Claude Mythos.tags: hype, clade, mythos, firefox, flaw…

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Just a few weeks ago we talked about the 271 vulnerabilities that Firefox had patched with the help of Claude Mythos Preview. That already sounded strong, really crazy because we didn’t talk about a browser or a project without audits on it, or new, that there would be excuse in such a case. We talked about Firefox, a software revised for years by internal teams, external researchers and fuzzing systems. Well, now Mozilla has counted the missing…

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El Chapuzas Informático broke the news on Saturday, May 9, 2026.
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