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Minimal, Local, Causal Explanations for Jailbreak Success in Large Language Models

Summary

Researchers propose LOCA, a method that identifies minimal interpretable changes in intermediate representations to causally explain why specific jailbreak prompts bypass safety training in LLMs. It outperforms prior global approaches, requiring only six changes on average to induce refusal.

SourcearXiv AIAuthor: Shubham Kumar, Narendra Ahuja
Minimal, Local, Causal Explanations for Jailbreak Success in Large Language Models
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[2605.00123] Minimal, Local, Causal Explanations for Jailbreak Success in Large Language Models

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Computer Science > Artificial Intelligence

arXiv:2605.00123 (cs)

[Submitted on 30 Apr 2026]

Title:Minimal, Local, Causal Explanations for Jailbreak Success in Large Language Models

Authors:Shubham Kumar, Narendra Ahuja

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Abstract:Safety trained large language models (LLMs) can often be induced to answer harmful requests through jailbreak prompts. Because we lack a robust understanding of why LLMs are susceptible to jailbreaks, future frontier models operating more autonomously in higher-stakes settings may similarly be vulnerable to such attacks. Prior work has studied jailbreak success by examining the model's intermediate representations, identifying directions in this space that causally encode concepts like harmfulness and refusal. Then, they globally explain all jailbreak attacks as attempting to reduce or strengthen these concepts (e.g., reduce harmfulness). However, different jailbreak strategies may succeed by strengthening or suppressing different intermediate concepts, and the same jailbreak strategy may not work for different harmful request categories (e.g., violence vs. cyberattack); thus, we seek to give a local explanation -- i.e., why did this specific jailbreak succeed? To address this gap, we introduce LOCA, a method that gives Local, CAusal explanations of jailbreak success by identifying a minimal set of interpretable, intermediate representation changes that causally induce model refusal on an otherwise successful jailbreak request. We evaluate LOCA on harmful original-jailbreak pairs from a large jailbreak benchmark across Gemma and Llama chat models, comparing against prior methods adapted to this setting. LOCA can successfully induce refusal by making, on average, six interpretable changes; prior work routinely fails to achieve refusal even after 20 changes. LOCA is a step toward mechanistic, local explanations of jailbreak success in LLMs. Code to be released.

Comments: Pre-print

Subjects:

Artificial Intelligence (cs.AI)

Cite as: arXiv:2605.00123 [cs.AI]

(or arXiv:2605.00123v1 [cs.AI] for this version)

https://doi.org/10.48550/arXiv.2605.00123

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arXiv-issued DOI via DataCite (pending registration)

Submission history

From: Shubham Kumar [view email] [v1] Thu, 30 Apr 2026 18:22:19 UTC (706 KB)

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Key points and analysis

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Key points

  • Prior work globally explains jailbreaks as reducing concepts like harmfulness, but overlooks strategy- and category-specific differences.
  • LOCA pinpoints the exact minimal causal changes for a given jailbreak success, averaging six changes.
  • Evaluated on Gemma and Llama models, LOCA outperforms baselines that fail even after 20 changes.

Highlights and analysis are generated automatically and may contain errors. Check the original source.