Anthropic pointed Claude Mythos Preview at 281 open-source projects and collected 23,019 candidate vulnerabilities. External security firms reviewed 1,900 of them. Maintainers received 1,596 reports and acknowledged 1,451; 97 fixes landed upstream, and 88 findings became published security advisories, with counts current as of May 22, 2026. The other 21,119 candidates have not been reviewed by anyone outside Anthropic. Anthropic puts the drop-off down to a shortage of people to check the work, and the … More
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