{"data":{"id":"f5b6ae68-26ce-4439-8063-599a680886b9","title":"LLMs are Getting a Lot Better and Faster at Finding and Exploiting Zero-Days","summary":"Claude Opus 4.6, a new AI model, is significantly better at finding zero-day vulnerabilities (security flaws unknown to vendors and the public) than previous models, discovering high-severity bugs in well-tested code that fuzzing tools (programs that test software by sending random inputs) had missed for years. Unlike traditional fuzzing, Opus 4.6 analyzes code like a human researcher would, studying past fixes and code patterns to reason about what inputs would cause failures.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"https://www.schneier.com/blog/archives/2026/02/llms-are-getting-a-lot-better-and-faster-at-finding-and-exploiting-zero-days.html","publishedAt":"2026-02-09T12:04:29.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"news","affectedPackages":null,"affectedVendors":["Anthropic"],"affectedVendorsRaw":["Anthropic","Claude Opus 4.6"],"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":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"advanced","impactType":["integrity"],"aiComponentTargeted":"model","llmSpecific":true,"classifierConfidence":0.85,"researchCategory":null,"atlasIds":null}}