Anthropic's Mythos model uncovers Rejetto HTTP File Server flaw now under active attack
The discovery demonstrates how advanced AI models can autonomously chain complex vulnerabilities together to achieve remote code execution in real world applications.
• Anthropic bug hunting model Mythos helped discover a critical authentication bypass vulnerability in Rejetto HTTP File Server.
• VulnCheck observed initial exploitation attempts originating from China and targeting hosts in the US and Japan.
• The flaw allows full admin access and remote code execution by leveraging a predictable Math.random function and an SMT solver.
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October 3, 2026 31
