2026
BadThink: Triggered Overthinking Attacks on Chain-of-Thought Reasoning in Large Language Models
AAAI 2026technical
Recent advances in Chain-of-Thought (CoT) prompting have substantially improved the reasoning capabilities of large language models (LLMs), but have also introduced their computational efficiency as a new attack surface. In this paper, we propose BadThink, the first backdoor attack designed to delib