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gregpr07
311mo ago
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GitHub Repository
PromtFuzz is an automated tool that generates high-quality fuzz drivers for libraries via a fuzz loop constructed on mutating LLMs' prompts.
336 starsRust
Harnessing LLM-Prompt Mutation to Build Smart,Automated Fuzz Drivers
by JasonHEIN·Apr 25, 2026·2 points·0 comments
AI Analysis
●●●BangerBig BrainSolve My Problem
Beats OSS-Fuzz coverage by 1.6x using LLMs to write harness code instead of inputs.
Strengths
- •Outperforms OSS-Fuzz and Hopper on branch coverage metrics significantly.
- •Found 33 valid bugs including confirmed CVEs in target libraries.
- •Automates harness writing via prompt mutation instead of generating inputs.
Weaknesses
- •Requires OpenAI-compatible LLM access, adding cost and latency to runs.
- •Niche applicability limits adoption to security teams running fuzzing infrastructure.
Category
Target Audience
Security researchers, library maintainers, fuzzing engineers
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OSS-Fuzz · Hopper · FuzzGen
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