{"data":{"id":"e6675b4f-af3a-4864-af13-79fa2ae32487","title":"PCM: A Proof-Carrying Message Protocol for Verifiable Multi-Agent Communication","summary":"The paper proposes Proof-Carrying Messages (PCM), a protocol in which each claim between AI agents carries evidence from an append-only Merkle log, with inclusion proofs signed by an attesting signer the agent cannot control. On a benchmark of 926 messages, 712 of them lies in 16 classes, PCM accepts 10 lies, all stale evidence (1.4%, 95% CI 0.8-2.6%), while plain A2A accepts all 712.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"https://arxiv.org/abs/2610.39109v1","publishedAt":"2026-10-29T00:50:34.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["prompt_injection"],"issueType":"research","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":["A2A","MCP","uAgents","AP2","Verifiable Intent"],"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":"2026-10-29T00:50:34.000Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity"],"aiComponentTargeted":"agent","llmSpecific":false,"classifierConfidence":0.9,"researchCategory":"preprint","atlasIds":["AML.T0051"]}}