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Fuzz4All: Universal Fuzzing with Large Language Models
Open accessAbstract
Fuzzing has achieved tremendous success in discovering bugs and vulnerabilities in various software systems. Systems under test (SUTs) that take in programming or formal language as inputs, e.g., compilers, runtime engines, constraint solvers, and software libraries with accessible APIs, are especially important as they are fundamental building blocks of software development. However, existing fuzzers for such systems often target a specific language, and thus cannot be easily applied to other languages or even other versions of the same language. Moreover, the inputs generated by existing fuzzers are often limited to specific features of the input language, and thus can hardly reveal bugs related to other or new features. This paper presents Fuzz4All, the first fuzzer that is universal in the sense that it can target many different input languages and many different features of these languages. The key idea behind Fuzz4All is to leverage large language models (LLMs) as an input generation and mutation engine, which enables the approach to produce diverse and realistic inputs for any practically relevant language. To realize this potential, we present a novel autoprompting technique, which creates LLM prompts that are well-suited for fuzzing, and a novel LLM-powered fuzzing loop, which iteratively updates the prompt to create new fuzzing inputs. We evaluate Fuzz4All on nine systems under test that take in six different languages (C, C++, Go, SMT2, Java, and Python) as inputs. The evaluation shows, across all six languages, that universal fuzzing achieves higher coverage than existing, language-specific fuzzers. Furthermore, Fuzz4All has identified 98 bugs in widely used systems, such as GCC, Clang, Z3, CVC5, OpenJDK, and the Qiskit quantum computing platform, with 64 bugs already confirmed by developers as previously unknown.
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“We use SWE-bench because it unites many separate SE tasks, such as automated program repair [10, 40, 55], bug localization [4, 58], and testing [22, 46, 56] under a single task formulation that faithfully mirrors practical SE.”
From SWE-agent: Agent-Computer Interfaces Enable Automated Software Engineering (2024) · cites this paper as [56]
In the citing paper
“Another factor is that LLMs have a strong understanding of programming languages, enabling them to perform testing tasks in multiple languages.”
From When LLMs meet cybersecurity: a systematic literature review (2025) · cites this paper as Xia et al. (2024)
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Cited by
Sorted by citations
SWE-agent: Agent-Computer Interfaces Enable Automated Software Engineering
Yang, J., Jimenez, C., Wettig, A., Lieret, K., Yao, S., Narasimhan, K., & Press, O. (2024) · Advances in Neural Information Processing Systems 37 · doi:10.52202/079017-1601 · Cited by 264
He, J., Treude, C., & Lo, D. (2025) · ACM Transactions on Software Engineering and Methodology · doi:10.1145/3712003 · Cited by 246
LLM-Based Multi-Agent Systems for Software Engineering: Literature Review, Vision and the Road Ahead
He, J., Treude, C., & Lo, D. (2024) · arXiv · doi:10.48550/arxiv.2404.04834 · Cited by 246
When LLMs meet cybersecurity: a systematic literature review
Zhang, J., Bu, H., Wen, H., Liu, Y., Fei, H., Xi, R., Li, L., Yang, Y., Zhu, H., & Meng, D. (2025) · Cybersecurity · doi:10.1186/s42400-025-00361-w · Cited by 383
“Xia et al. (2024) tests 6 languages code (i.e., C, C ++ , Go, SMT2, Java, and Python) with a method named Fuzz-Loop, which automatically mutates test cases based on LLMs.”
Enhancing Autonomous System Security and Resilience With Generative AI: A Comprehensive Survey
Lopez, M. A., Lunardi, W. T., Lawton, G., & Thakkar, S. (2024) · IEEE Access · doi:10.1109/access.2024.3439363 · Cited by 128
Metadata
- Authors
- Xia, C. S., Paltenghi, M., Le Tian, J., Pradel, M., & Zhang, L.
- Affiliations
- University of Illinois Urbana-Champaign (US)
- University of Stuttgart (DE)
- UIUC, Urbana, Illinois, USA
- Venue
- Proceedings of the IEEE/ACM 46th International Conference on Software Engineering
- Publisher
- ACM
- Published
- 2024-04-12
- Pages
- 1-13
- ISSN
- 0270-5257 (ISSN-L)
- OpenAlex
- W4394769544
- Cited by
- 229
- References
- 42
- Citations by year
- 2026: 93 · 2025: 103 · 2024: 31
- FWCI
- 61.97
- Type
- conference paper
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- ACM/IEEE International Conference on Software Engineering: Companion Proceedings (ICSE-Companion) (publishedVersion)
- arXiv (Cornell University) (submittedVersion, cc-by)
- arXiv (Cornell University) (cc-by)
- Funders
- National Science Foundation (CCF-2141474, CCF-2131943)
- Topics
- Physical Sciences › Computer Science › Software › Software Testing and Debugging Techniques
- Physical Sciences › Computer Science › Information Systems › Software Engineering Research
- Physical Sciences › Computer Science › Computational Theory and Mathematics › Formal Methods in Verification
- Keywords
- large language models, input generation, input mutation, compiler bugs, SMT solvers, software vulnerability detection, coverage-guided fuzzing, Qiskit
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