{"data":{"id":"29059fd7-c07f-45c8-8410-4ef5b597c767","title":"Anthropic’s Mythos Model Found Vulnerabilities in Classified US Government Systems, Official Says","summary":"Anthropic's Mythos AI model identified vulnerabilities in classified U.S. government computer systems within hours during a security testing initiative called Project Glasswing, according to a U.S. official. The testing was conducted in cooperation with U.S. intelligence agencies to assess potential security risks the model could pose. In response, the Trump administration issued a directive requiring Anthropic to prevent foreign nationals from accessing its latest models (Fable 5 and Mythos 5), and Anthropic disabled these models for all customers to comply.","solution":"Anthropic disabled the Mythos and Fable models for all of its customers to comply with the Trump administration's directive requiring the company to prevent foreign nationals from using its latest artificial intelligence models, known as Fable 5 and Mythos 5.","labels":["security","policy"],"sourceUrl":"https://www.securityweek.com/anthropics-mythos-model-found-vulnerabilities-in-classified-us-government-systems-official-says/","publishedAt":"2026-06-24T03:29:58.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Mythos","Mythos 5","Fable 5"],"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":"2026-06-24T03:29:58.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity"],"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.92,"researchCategory":null,"atlasIds":null}}