{"data":{"id":"391b6e40-bf85-455c-8c97-68ee4607cd58","title":"GuardRAG: A Post-Retrieval Defense against Poisoning Attacks in Retrieval-Augmented Generation","summary":"GuardRAG is a training-free, plug-and-play post-retrieval defense against corpus poisoning in Retrieval-Augmented Generation. It expands retrieval, removes near-duplicate candidates, clusters the retained documents with Hierarchical Agglomerative Clustering using a query-adaptive threshold, then scores and prunes suspicious clusters by query relevance, cluster size and semantic compactness. Experiments across three question-answering datasets, multiple poisoning attacks and six LLMs show it substantially reduces attack success rates while maintaining answer utility under clean retrieval.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"https://arxiv.org/abs/2610.35071v1","publishedAt":"2026-10-26T09:17:29.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["rag_poisoning"],"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":"2026-10-26T09:17:29.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity"],"aiComponentTargeted":"rag","llmSpecific":true,"classifierConfidence":0.95,"researchCategory":"preprint","atlasIds":["AML.T0070"]}}