Author

Xiao-Jun Jia

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Preprint Oct 2026

ASCENT: First-Order Optimal Fine-Tuning with Recalibration for Safety--Utility Co-Enhancement

Supervised fine-tuning can substantially improve the downstream utility of large language models (LLMs) but may compromise their safety. Existing safety-preserving methods constrain downstream updates using safety-related parameters or subspaces, but mainly focus on safety preservation rather than joint safety and util...

Wei-Wei Qi, Chong-Yu Wang, Tian-Hang Zheng et al. · 0 citations

Preprint Aug 2026

ElasticBack: Stealthy Conditional Backdoor in LLM-Agent Skills via Coupled Trigger-Rule Optimization

ElasticBack is presented, an effective conditional single-skill backdoor that plants a rule R in the skill document and a benign-looking trigger T in the user query, so the malicious payload fires only when both co-occur, and motivates stronger defenses for the skill supply chain.

Hao Sui, Si-Meng Qin, Jie Liao et al. · 0 citations

Preprint Aug 2026

ColluSkill: Adversarial Cross-Skill Composition for Evading Agent Skill Scanners

ColluSkill is proposed, a collusive multi-skill-chain attack framework that decomposes a complete malicious intent into interdependent sub-payloads embedded in independently packaged skills and employs LLM-based chain planning and scanner-feedback refinement to preserve chain-level attack semantics.

Pu-Yu Zeng, Simeng Qin, Jingzhi Li et al. · 1 citation