A Failure-Mode Benchmark for Polymorphic Sybil Poisoning in RAG
We release a benchmark and failure-mode-aware evaluation framework for grounded QA under coordinated retrieval poisoning. The framework partitions reader outputs into four mutually exclusive categories (\emph{gold}, \emph{hijack}, \emph{abstention}, \emph{drift}), with instance-level paired clean-to-poison transition matrices and a Forced Exposure protocol isolating reader-side conflict resolution from retrieval variance. We introduce \emph{polymorphic sybil poisoning}, a coordinated attack class in which $S$ lexically diverse passages jointly support an attacker-chosen target while evading lexical near-duplicate filters that fully detect monomorphic baselines (capturing the residual 14.2...
| Authors | Donghyun Lee, Juntae Kim |
|---|---|
| Primary category | cs.CR |
| Published | 4 July 2026 |
| Last updated at source | 4 July 2026 |
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