{"data":{"id":"98f2cec5-d291-43c8-8b2a-b5cd687dec9e","title":"Ignored, Not Refused: What Low Prompt-Injection Success Rates Hide in Small Tool-Using Agents","summary":"Benchmarks for indirect prompt injection in tool-using agents usually report attack success rate, which counts every failed attack as a defense. An audit of 33,000 trajectories from eleven open-weight agents (2-14B parameters) on InjecAgent and AgentDojo found that most failed attacks were ignored (76-80%) rather than refused (17-18%). Changing only the system prompt moved InjecAgent ASR from 0.2% to 43% with identical weights, and 21.7% of AgentDojo episodes stayed safe without completing the user's task.","solution":"The source recommends that evaluations report how attacks fail and whether the user's task is completed, alongside ASR. It also releases the labeled corpus, judge prompt, and analysis code.","labels":["security","research"],"sourceUrl":"https://arxiv.org/abs/2610.23254v1","publishedAt":"2026-10-16T10:26:23.000Z","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":"2026-10-16T10:26:23.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["integrity"],"aiComponentTargeted":"agent","llmSpecific":true,"classifierConfidence":0.95,"researchCategory":"preprint","atlasIds":["AML.T0051"]}}