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Large Vision-Language Models face growing safety challenges with multimodal inputs. This paper introduces the concept of Implicit Reasoning Safety, a vulnerability in LVLMs. Benign combined inputs trigger unsafe LVLM outputs due to flawed…

Artificial Intelligence · Computer Science 2025-08-13 Wei Cai , Jian Zhao , Yuchu Jiang , Tianle Zhang , Xuelong Li

Multimodal large language models (MLLMs) are increasingly integrated into autonomous driving (AD) systems; however, they remain vulnerable to diverse safety threats, particularly in accident-prone scenarios. Recent safeguard mechanisms have…

Artificial Intelligence · Computer Science 2026-05-12 Tianyuan Zhang , Peng Yue , Zihao Peng , Jiangfan Liu , Zonghao Ying , Jiakai Wang , Tianlin Li , Jian Yang , Yaodong Yang , Aishan Liu , Xianglong Liu

While there has been progress towards aligning Large Language Models (LLMs) with human values and ensuring safe behaviour at inference time, safety guards can easily be removed when fine tuned on unsafe and harmful datasets. While this…

The emergence of vision language models (VLMs) comes with increased safety concerns, as the incorporation of multiple modalities heightens vulnerability to attacks. Although VLMs can be built upon LLMs that have textual safety alignment, it…

Cryptography and Security · Computer Science 2025-02-18 Qin Liu , Fei Wang , Chaowei Xiao , Muhao Chen

Powered by remarkable advancements in Large Language Models (LLMs), Multimodal Large Language Models (MLLMs) demonstrate impressive capabilities in manifold tasks. However, the practical application scenarios of MLLMs are intricate,…

Computation and Language · Computer Science 2024-06-18 Tianle Gu , Zeyang Zhou , Kexin Huang , Dandan Liang , Yixu Wang , Haiquan Zhao , Yuanqi Yao , Xingge Qiao , Keqing Wang , Yujiu Yang , Yan Teng , Yu Qiao , Yingchun Wang

Multimodal Large Language Models (MLLMs) pose critical safety challenges, as they are susceptible not only to adversarial attacks such as jailbreaking but also to inadvertently generating harmful content for benign users. While internal…

Machine Learning · Computer Science 2026-03-17 Ming Wen , Kun Yang , Xin Chen , Jingyu Zhang , Dingding Han , Shiwen Cui , Yuedong Xu

As LLMs become increasingly prevalent across various applications, it is critical to establish safety guardrails to moderate input/output content of LLMs. Existing guardrail models treat various safety categories independently and fail to…

Artificial Intelligence · Computer Science 2024-07-09 Mintong Kang , Bo Li

Safety alignment is critical for LLM-powered systems. While recent LLM-powered guardrail approaches such as LlamaGuard achieve high detection accuracy of unsafe inputs written in English (e.g., ``How to create a bomb?''), they struggle with…

Computation and Language · Computer Science 2025-07-18 Wenliang Shan , Michael Fu , Rui Yang , Chakkrit Tantithamthavorn

Recent advances in LLMs have enhanced AI capabilities, but also increased the risk posed by malicious requests, highlighting the need for effective LLM safeguards to detect such queries. Existing approaches largely rely on classifier-based…

Computation and Language · Computer Science 2025-10-14 Zhuowei Chen , Bowei Zhang , Nankai Lin , Tian Hou , Lianxi Wang

Multi-modal large language models (MLLMs) have made significant progress, yet their safety alignment remains limited. Typically, current open-source MLLMs rely on the alignment inherited from their language module to avoid harmful…

Cryptography and Security · Computer Science 2025-04-15 Yanbo Wang , Jiyang Guan , Jian Liang , Ran He

Current vision large language models (VLLMs) exhibit remarkable capabilities yet are prone to generate harmful content and are vulnerable to even the simplest jailbreaking attacks. Our initial analysis finds that this is due to the presence…

Machine Learning · Computer Science 2024-06-19 Yongshuo Zong , Ondrej Bohdal , Tingyang Yu , Yongxin Yang , Timothy Hospedales

Large language models (LLMs) now mediate many web-based mental-health, crisis, and other emotionally sensitive services, yet their psychosocial safety in these settings remains poorly understood and weakly evaluated. We present DialogGuard,…

Artificial Intelligence · Computer Science 2025-12-03 Han Luo , Guy Laban

As Multimodal Large Language Models (MLLMs) acquire stronger reasoning capabilities to handle complex, multi-image instructions, this advancement may pose new safety risks. We study this problem by introducing MIR-SafetyBench, the first…

Computer Vision and Pattern Recognition · Computer Science 2026-01-21 Renmiao Chen , Yida Lu , Shiyao Cui , Xuan Ouyang , Victor Shea-Jay Huang , Shumin Zhang , Chengwei Pan , Han Qiu , Minlie Huang

The robustness and security of large language models (LLMs) has become a prominent research area. One notable vulnerability is the ability to bypass LLM safeguards by translating harmful queries into rare or underrepresented languages, a…

Computation and Language · Computer Science 2025-09-16 Hongliang Li , Jinan Xu , Gengping Cui , Changhao Guan , Fengran Mo , Kaiyu Huang

Multimodal large language models (MLLMs) are essential for building general-purpose AI assistants; however, they pose increasing safety risks. How can we ensure safety alignment of MLLMs to prevent undesired behaviors? Going further, it is…

Multimodal Large Language Models (MLLMs) are susceptible to the implicit reasoning risk, wherein innocuous unimodal inputs synergistically assemble into risky multimodal data that produce harmful outputs. We attribute this vulnerability to…

Artificial Intelligence · Computer Science 2025-09-17 Wei Cai , Shujuan Liu , Jian Zhao , Ziyan Shi , Yusheng Zhao , Yuchen Yuan , Tianle Zhang , Chi Zhang , Xuelong Li

The security concerns surrounding Large Language Models (LLMs) have been extensively explored, yet the safety of Multimodal Large Language Models (MLLMs) remains understudied. In this paper, we observe that Multimodal Large Language Models…

Computer Vision and Pattern Recognition · Computer Science 2024-06-21 Xin Liu , Yichen Zhu , Jindong Gu , Yunshi Lan , Chao Yang , Yu Qiao

We introduce Llama Guard, an LLM-based input-output safeguard model geared towards Human-AI conversation use cases. Our model incorporates a safety risk taxonomy, a valuable tool for categorizing a specific set of safety risks found in LLM…

To enhance the safety of VLMs, this paper introduces a novel reasoning-based VLM guard model dubbed GuardReasoner-VL. The core idea is to incentivize the guard model to deliberatively reason before making moderation decisions via online RL.…

Artificial Intelligence · Computer Science 2025-05-19 Yue Liu , Shengfang Zhai , Mingzhe Du , Yulin Chen , Tri Cao , Hongcheng Gao , Cheng Wang , Xinfeng Li , Kun Wang , Junfeng Fang , Jiaheng Zhang , Bryan Hooi

Omni-modal Large Language Models (OLLMs) that process text, images, videos, and audio introduce new challenges for safety and value guardrails in human-AI interaction. Prior guardrail research largely targets unimodal settings and typically…

Artificial Intelligence · Computer Science 2025-12-03 Boyu Zhu , Xiaofei Wen , Wenjie Jacky Mo , Tinghui Zhu , Yanan Xie , Peng Qi , Muhao Chen