Most of the bugs Claude Mythos found have never been checked by a human

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.