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Anthropic: All your zero-days are belong to Mythos

ID: 9270b7dd-d214-5662-a812-eb936f81cdcc

STIX ID: report--9270b7dd-d214-5662-a812-eb936f81cdcc

Feed Name: The Register (Security)

Threat Score
80/100

Date Published: 2026-04-07

Date Updated: 2026-04-26

Author: Thomas Claburn

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The report details Anthropic's Mythos, an AI model claimed to autonomously identify and produce working zero-day exploits (reportedly a 72.4% success rate in tests) across major OSes and browsers; Anthropic provided a limited preview to industry partners under Project Glasswing and is coordinating responsible disclosure after Mythos found thousands of high- and critical-severity vulnerabilities.

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