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GetYourBrief Cybersecurity desk · June 24, 2026
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Vulnerability · on the rundown Wednesday, June 24, 2026

Anthropic's Mythos model found vulnerabilities in classified US systems, official says

Covered by 5 outlets over 5 hours. They ran 2 distinct reports; the most widely run, a syndicated copy, appeared on 3 sites. First reported by mynorthwest.com at 01:15 UTC on June 24, 2026.

5 outlets

What happened?

  1. An anonymous U.S. official later clarified that Mythos’s vulnerability identification within hours did not confirm the model’s ability to exploit those vulnerabilities operationally.

Anthropic’s Mythos model found vulnerabilities in classified U.S. government systems, an official said. According to one official, vulnerabilities in classified systems belonging to the US government were found by Anthropic's Mythos model.

A machine summary written from the reports listed below; read them for the full account. How summaries are made and what is checked.

Who reported it, and when?

2 distinct reports run by 5 outlets, earliest first (UTC); a syndicated report lists every site that ran it
TimeReportRun by
Jun 24 01:15Anthropic Mythos model found vulnerabilities in classified US government systems, official says
Jun 24 03:29Anthropic’s Mythos Model Found Vulnerabilities in Classified US Government Systems, Official Says

Who was named?

More news naming Anthropic

  1. Oct 13 · Legal Anthropic asks D.C. Circuit to rehear Pentagon blacklisting appeal 2
  2. Oct 13 · AI Anthropic moves off git as daily code merges pass 30,000 2
  3. Oct 13 · AI Anthropic says small models near self-replication on IoT devices 6
  4. Oct 13 · AI India Today: “China building AI task force with 1,000+ scientists to beat OpenAI and Anthropic at maths” 2
  5. Oct 13 · Legal Taoiseach to chair new Cabinet committee covering AI regulation 2
  6. Oct 13 · Cyber Anthropic says small AI models may self-replicate on home devices 2
  7. Oct 12 · AI Anthropic reports progress on blocking model distillation attacks 2
  8. Oct 12 · AI Microsoft executives call for "emergency brakes" on AI models 3

Sources: the outlets' reports linked on this page; counts and times from GetYourBrief's record of those reports (methodology).