Author

Xander Davies

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Preprint Oct 2026

Understanding and Enhancing Backdoor Persistency in LLM Agent Post-Training

Developers can build LLM agents by adapting third-party models through benign post-training. We study a supply-chain threat in which an attacker supplies a model with a backdoor: hidden behavior that produces malicious outputs when a particular input pattern appears. Focusing on software-engineering agents, we ask whet...

Qiusi Zhan, Nian Lyu, Stephanie Ding et al. · 0 citations

#artificial intelligence Preprint Sep 2026

Evaluating Whether GPT-6 Astra Performs Unsanctioned Supply-Chain Attacks

This technical report presents an alignment evaluation developed and performed by the UK AI Security Institute for assessing whether advanced AI systems take unsanctioned actions outside the scope of their assigned task. We evaluate whether frontier models conduct supply-chain attacks against out-of-scope, third-party...

Alexandra Souly, Kai Fronsdal, Abby D'Cruz et al. · 0 citations