Critical-Infrastructure

Anthropic Mythos LLM Scans Federal Software for Vulnerabilities

ATLAS OWASP MEDIUM ▲ 6.5 SecurityWeek Jul 08, 2026

CISA's Attack Surface Evaluation team is reportedly leveraging Anthropic's 'Mythos' model to scan federal government software for security vulnerabilities, representing a significant expansion of AI-assisted offensive security tooling in critical infrastructure defence. The deployment raises important questions about the trustworthiness of LLM-driven vulnerability assessment, potential for model-induced false negatives, and the security of the AI pipeline itself when applied to sensitive government codebases. This marks one of the most prominent known uses of a commercial LLM in an active U.S. government cyber defence role.

Anthropic's Mythos AI Breached Classified US Government Systems in Hours

ATLAS OWASP CRITICAL ▲ 9.1 SecurityWeek Jun 24, 2026

Anthropic's Mythos AI model identified vulnerabilities in classified US government computer systems within hours during a government-sanctioned testing exercise under Project Glasswing. A senior US official confirmed the findings to the Associated Press, corroborating statements made by Sen. Mark Warner that the model 'broke into almost all of our classified systems.' The incident marks a landmark demonstration of AI-enabled offensive cyber capability at the highest sensitivity levels of government infrastructure.

Anthropic's Mythos 5 and Fable 5 Hit by Export Block

FIRST LOOK ATLAS OWASP HIGH ▲ 7.2 TechCrunch AI Jun 18, 2026

The Trump administration's June 2026 export block on Anthropic's Mythos 5 and Fable 5 models has forced a long-overdue reckoning with AI vendor dependency as a first-class operational risk, giving security and procurement teams the concrete, real-world evidence needed to justify resilience investments that were previously treated as theoretical. This event closes a critical gap in organisational risk registers by demonstrating that AI model access continuity must be governed with the same rigour applied to any mission-critical third-party dependency — complete with contingency planning, contractual protections, and evaluated alternatives. What remains unaddressed is the absence of industry-wide standards for AI vendor continuity obligations, leaving individual organisations to negotiate protections without consistent benchmarks.

US summons bank bosses over cyber risks from Anthropic's latest AI model

ATLAS OWASP CRITICAL ▲ 8.5 HN AI Security Apr 10, 2026

The US Treasury convened major bank executives to discuss cybersecurity risks posed by Anthropic's unreleased Claude Mythos model, which the company claims has surpassed nearly all human experts at finding and exploiting software vulnerabilities. A code leak prompted Anthropic to publicly acknowledge the model's unprecedented offensive cyber capability, raising systemic financial sector risk concerns. The meeting signals growing regulatory awareness of AI-enabled cyber threats to critical financial infrastructure.

Claude Source Code Leak Reveals AI Supply Chain Risk

ATLAS OWASP HIGH ▲ 8.2 Dark Reading Apr 03, 2026

A reported source code leak affecting Claude, Anthropic's large language model, underscores systemic weaknesses in AI software supply chains and the absence of robust oversight mechanisms at critical development and distribution layers. The incident highlights how proprietary model code, training pipelines, and system prompts can become high-value targets for adversarial actors seeking to enable model theft, backdoor insertion, or competitive intelligence gathering. This event serves as a broader warning about treating AI development infrastructure with the same rigor applied to other critical systems.