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New serious vulnerabilities spiked around release of Claude Mythos Preview

In April 2026, Anthropic announced that its Claude Mythos Preview model could autonomously discover and exploit cybersecurity vulnerabilities. Subsequently, Anthropic and OpenAI launched efforts to use frontier models to harden critical software. Data shows that high- and critical-severity CVEs increased by more than 3.5x in June compared to the previous monthly record.

SourceHacker News AIAuthor: cubefox
New serious vulnerabilities spiked around release of Claude Mythos Preview
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Key points and analysis

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Key points

  • Anthropic announced Claude Mythos Preview's autonomous vulnerability discovery and exploitation capability in April 2026.
  • Both Anthropic and OpenAI initiated projects to harden critical software using frontier models.
  • High- and critical-severity vulnerabilities surged over 3.5x in June compared to prior monthly records.

Highlights and analysis are generated automatically and may contain errors. Check the original source.

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