{"data":{"id":"c5b0d672-1877-4018-aada-32672a7f5b18","title":"AgentTrace: Execution-Level Fingerprinting of Black-Box LLM Agents","summary":"AgentTrace is an active framework that identifies the foundation model behind a black-box LLM agent from observable execution traces. It injects structurally ambiguous probes that trigger tokenization-sensitive serialization failures at rigid tool interfaces, then models the sequence of repair operations with lightweight Markov chains. The method reaches 96.0% attribution accuracy under adversarial identity spoofing and separates intra-family variants that share tokenizers, such as Llama-3 8B and 70B.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"https://arxiv.org/abs/2610.32092v1","publishedAt":"2026-10-23T02:55:15.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"research","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":["Llama-3 8B","Llama-3 70B"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":null,"epssScore":null,"epssCheckedAt":null,"kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":null,"disclosureDate":"2026-10-23T02:55:15.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":null,"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.9,"researchCategory":"preprint","atlasIds":null}}