{"data":{"id":"72886df3-26bf-4b09-92f7-dfe8b2f5cda7","title":"Anthropic Launches Claude Fable 5: Mythos-Class AI With Cybersecurity Guardrails ","summary":"Anthropic released Claude Fable 5, a powerful AI model with safety restrictions that automatically switch to a less capable version when users try to use it for high-risk tasks like cybersecurity or biology. The company tested these safeguards extensively through internal testing and external bug bounty programs (paying security researchers to find vulnerabilities) spanning over 1,000 hours, and no universal jailbreaks (methods to bypass the restrictions) were discovered.","solution":"N/A -- no mitigation discussed in source.","labels":["safety","security"],"sourceUrl":"https://www.securityweek.com/anthropic-launches-claude-fable-5-mythos-class-ai-with-cybersecurity-guardrails/","publishedAt":"2026-06-09T17:02:08.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Claude Fable 5","Claude Mythos 5","Claude Opus 4.8","Dragos","Tenable","Trend Micro","Netskope","BeyondTrust","Rubrik","BT","Intercontinental Exchange","Hitachi"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"patchAvailable":null,"disclosureDate":"2026-06-09T17:02:08.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["safety"],"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.92,"researchCategory":null,"atlasIds":null}}