{"data":{"id":"01f9a557-3720-4270-911e-8455d6b295df","title":"SpanGuard: Decoupling Instruction Localization from Authorization for Lightweight IPI Defense","summary":"SpanGuard is a lightweight guardrail against indirect prompt injection (IPI) that splits detection into two steps. It first locates candidate injected instructions in tool outputs using unsupervised segmentation, then uses a small language model to judge whether each block is authorized by the user's request. The authors report a 0.32% attack success rate with negligible loss in benign utility, while remaining effective with substantially smaller models.","solution":"N/A -- no mitigation discussed in source.","labels":["security","research"],"sourceUrl":"https://arxiv.org/abs/2610.26013v1","publishedAt":"2026-10-19T08:36:20.000Z","cveId":null,"cweIds":null,"cvssScore":null,"cvssSeverity":null,"severity":"info","attackType":["prompt_injection"],"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":"2026-10-19T08:36:20.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity","safety"],"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.95,"researchCategory":"preprint","atlasIds":["AML.T0051"]}}