SoK: Evaluating Jailbreak Guardrails for Large Language Models
Authors: name: Xunguang Wang, name: Zhenlan Ji, name: Wenxuan Wang, name: Zongjie Li, name: Daoyuan Wu, name: Shuai Wang

Large Language Models (LLMs) have achieved remarkable progress, but their
deployment has exposed critical vulnerabilities, particularly to jailbreak
attacks that circumvent safety mechanisms. Guardrails--external defense
mechanisms that monitor and control LLM interaction--have emerged as a
promising solution. However, the current landscape of LLM guardrails is
fragmented, lacking a unified taxonomy and comprehensive evaluation framework.
In this Systematization of Knowledge (SoK) paper, we present the first holistic
analysis of jailbreak guardrails for LLMs. We propose a novel,
multi-dimensional taxonomy that categorizes guardrails along six key
dimensions, and introduce a Security-Efficiency-Utility evaluation framework to
assess their practical effectiveness. Through extensive analysis and
experiments, we identify the strengths and limitations of existing guardrail
approaches, explore their universality across attack types, and provide
insights into optimizing defense combinations. Our work offers a structured
foundation for future research and development, aiming to guide the principled
advancement and deployment of robust LLM guardrails. The code is available at
https://github.com/xunguangwang/SoK4JailbreakGuardrails.