Author

Yi-Shu Gao

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Preprint Sep 2026

BMA: Backchain Memory Attacks Create Unauthorized Control Paths in LLM Agents

Persistent memory enables LLM agents to reuse prior experience, but creates a new security boundary: what an agent may remember is not what it should act on. We expose an unauthorized control path where edited low-trust evidence is consolidated into persistent memory, retrieved on a clean task, and used to drive a prot...

Kai-Sheng Fan, Yi-Shu Gao, Xun-Zhu Tang et al. · 0 citations

Preprint Sep 2026

LENS: The Sum Is Worse Than the Parts for Set-Level Poisoning in Retrieval-Augmented Generation

Retrieval-augmented generation (RAG) aggregates evidence from multiple external documents, yet this joint integration creates an underexamined vulnerability: attack effects absent in individual documents can emerge through set-level composition. Existing coordinated attacks do not explicitly enforce that every proper s...

Kai-Sheng Fan, Yi-Shu Gao, Xun-Zhu Tang et al. · 0 citations