{"data":{"id":"091f80eb-0910-43b2-aba1-7ffa541778d6","title":"Session-Bound Behavioral Watermarking for Autonomous LLM Agents","summary":"AgentAnchor is a session-keyed behavioral watermark for attributing LLM agent trajectory logs to their owner. Each step key derives from a secret key, a fresh public session identifier, and semantic states of recent observations, and parity evidence is embedded through a KL-bounded exponential tilt. The authors formulate a learned-forgery threat, in which repeated observation of watermarked trajectories enables cross-session forgery through learned action preferences.","solution":"N/A -- no mitigation discussed in source.","labels":["research","security"],"sourceUrl":"https://arxiv.org/abs/2610.38579v1","publishedAt":"2026-10-28T10:09:23.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":[],"issueType":"research","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":[],"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":"2026-10-28T10:09:23.000Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"advanced","impactType":["integrity"],"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.93,"researchCategory":"preprint","atlasIds":null}}