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  1. 9912d63 [Courgette] Reduce AssemblyProgram to reduce Courgette-apply RAM floor and disk churn. by huangs · 9 days ago master
  2. 9d305a7 [libfuzzer] Use only_ascii=1 option for v8_script_parser_fuzzer. by mmoroz · 14 days ago
  3. 0462397 [clusterfuzz][wasm] Use a new corpus directory by ahaas · 3 weeks ago
  4. cd98712 Update OWNERS: remove aizatsky@, ensure 2+ owners everywhere. by mmoroz · 5 weeks ago
  5. 5374cf4 Convert MediaLog from being ref counted to owned by WebMediaPlayer. by dalecurtis · 5 weeks ago

libFuzzer in Chrome


This directory contains integration between libFuzzer and Chrome. libFuzzer is an in-process coverage-driven evolutionary fuzzer. It helps engineers to uncover potential security & stability problems earlier.

Requirements: libFuzzer in Chrome is supported with GN on Linux only. Check Reference for experimental platform availability.

Integration Status

Fuzzer tests are well-integrated with Chrome build system & distributed ClusterFuzz fuzzing system. Cover bug:


  • Getting Started Guide walks you through all the steps necessary to create your fuzzer and submit it to ClusterFuzz.
  • Efficient Fuzzer Guide explains how to measure fuzzer effectiveness and ways to improve it.
  • ClusterFuzz Integration describes integration between ClusterFuzz and libFuzzer.
  • Reproducing contains information on how to reproduce bugs reported by ClusterFuzz.
  • Reference contains detailed references for different integration parts.


  • ClusterFuzz Bugs - issues found and automatically filed by ClusterFuzz.
  • Manual Bugs - issues that were filed manually after running fuzzers.
  • Pdfium Bugs - bugs found in pdfium by manual fuzzing.
  • OSS Trophies - bugs found with libFuzzer in open-source projects.

Blog Posts

Project Links