CVE disclosures spike 3.5× after Anthropic's Claude Mythos cybersecurity announcement
By
Luke Emberson
Summary
Following Anthropic's April 2026 announcement that its Claude Mythos Preview model could autonomously discover and exploit cybersecurity vulnerabilities, both Anthropic and OpenAI launched initiatives to harden critical software. Epoch AI data shows a dramatic 3.5× spike in disclosed high- and critical-severity CVEs in June 2026 compared to pre-Mythos records, with ~1,300 vulnerabilities disclosed by notable organizations — likely driven by Project Glasswing and similar AI-powered security efforts.
Source
Hacker NewsCVE disclosures spike 3.5× after Anthropic's Claude Mythos cybersecurity announcementepoch.aiKey quotes
· 3 pulledIn April 2026, Anthropic announced that its latest internal model (Claude Mythos Preview) was capable of autonomous cybersecurity vulnerability discovery and exploitation.
Since then, both Anthropic and OpenAI have launched efforts to use frontier models to harden critical software before malicious actors are able to use the same models for harm.
Notable organizations disclosed ~1,300 high- and critical-severity CVEs in June 2026, roughly 3.5× the pre-Mythos monthly record.
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