libFuzzer Integration Guide

Integrate libFuzzer with Vulnetix. Write fuzz targets compiled with -fsanitize=fuzzer, run them to discover crashes, and convert findings to JSON.

Install & scan

$ # Ubuntu/Debian
sudo apt-get install clang llvm

# macOS via Homebrew
brew install llvm

# Verify: libFuzzer is part of clang
clang -fsanitize=fuzzer empty.c -o test && echo "libFuzzer available"
$ # Compile the fuzz target
clang++ -g -fsanitize=fuzzer,address fuzz_target.cc -o fuzz_target

# Run the fuzzer
./fuzz_target -max_total_time=300 corpus/

Run libFuzzer in CI

Scan on every push and upload the results to Vulnetix:

- name: Install Clang
  run: sudo apt-get install -y clang

- name: Build fuzz target
  run: clang++ -g -fsanitize=fuzzer,address fuzz_target.cc -o fuzz_target

- name: Run libFuzzer (2 minutes)
  run: |
    timeout 120 ./fuzz_target -max_total_time=120 corpus/ || true
    ls crash-* 2>/dev/null && echo "Crashes found!" || echo "No crashes"

Centralise libFuzzer results in Vulnetix

Upload libFuzzer JSON output to the Vulnetix platform to deduplicate findings, prioritise them with EPSS, CISA KEV and Coalition ESS exploit intelligence, and track remediation across every scanner in a single queue.

libFuzzer documentation ↗

Wire libFuzzer into your CI/CD pipeline →