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arXiv · 2607.18108

GARAGE: Characterizing the Automation Boundary in LLM-based Attack Graph Generation

Daekwon Pi·Sangho Lee·Young Hun Lee·Huy Kang Kim
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Abstract

While modern vehicle security depends on effective Cyber Threat Intelligence (CTI) synthesis, current automated tools struggle with unstructured data and automotive-specific architectural nuances. To bridge this gap, we introduce GARAGE, a RAG-powered framework that converts fragmented CTI into an actionable, domain-specific knowledge base for automated attack graph generation. GARAGE synthesizes a dataset of 12,786 CVEs and 140 incident reports into a STIX 2.1 and Auto-ISAC ATM-compliant knowledge base. By formalizing tactical-pattern-level scenarios through granular kill chain analysis, GARAGE achieves threat generation capabilities. Our 320 Leave-One-Out experiments reveal that the framework can accurately transfer security knowledge to entirely unseen vehicle architectures. Furthermore, we position GARAGE as a scalable TARA support tool within human-in-the-loop workflows, offering a comprehensive cost-performance analysis to guide its deployment across various LLM tiers.

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Daekwon Pi, Sangho Lee, Young Hun Lee, Huy Kang Kim. 2026-07-20. GARAGE: Characterizing the Automation Boundary in LLM-based Attack Graph Generation. https://arxiv.org/abs/2607.18108

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