# google/clusterfuzz

Scalable fuzzing infrastructure.

Repository: https://github.com/google/clusterfuzz
Canonical: https://ross.abutalabs.com/products/clusterfuzz
Homepage: https://google.github.io/clusterfuzz
Language: Python
License: Apache-2.0
License Family: permissive
Topics: fuzzing, security, stability, vulnerabilities
Last push: 2026-08-26T23:11:00+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 2774, "days_push": 7, "days_rel": 9, "gap_med": 2, "n_releases_24m": 100}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5597, forks 629 (observed 2026-08-28T04:09:22.779081+00:00)

## What it is
ClusterFuzz is Google's scalable fuzzing infrastructure that finds security and stability bugs in software, serving as the backend for OSS-Fuzz. It supports multiple fuzzing engines, crash deduplication, automatic bug filing and triage, and a web UI for managing fuzzing at cluster scale.

## Use cases
- run continuous fuzzing on my software project
- find security vulnerabilities automatically with fuzzing
- set up an OSS-Fuzz-like fuzzing backend
- deduplicate and triage fuzzer crashes automatically
- minimize fuzzing testcases and find regression ranges
- fuzz my project in CI with ClusterFuzzLite

## When to choose
- you need large-scale, continuously running fuzzing across many machines
- you want automated crash deduplication, bug filing, and regression bisection
- you are integrating with OSS-Fuzz or supporting libFuzzer/AFL++/Honggfuzz targets

## When to avoid
- you only need occasional local fuzzing runs - use the fuzzing engines directly or ClusterFuzzLite
- you want a lightweight CI-only fuzzing setup without infrastructure overhead
- you cannot operate a cluster of VMs or containers

## Facets
- artifact type: service
- maturity: active
- function: fuzzing, security, vulnerability-scanning, testing, monitoring
- domain: security, developer-tools, testing
- platform: python, cloud, self-hosted
- tags: fuzzing-infrastructure, oss-fuzz, crash-deduplication, bug-triage, coverage-guided-fuzzing, libfuzzer, afl, testcase-minimization, bisection, devops, linux, docker

## Member repositories
- google/clusterfuzz (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:22.779081+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:55:28.619272+00:00, confidence not recorded.
  - readme: https://github.com/google/clusterfuzz (fetched 2026-08-28T04:09:22.779081+00:00, sha 88b5b0a4743d)
  - homepage: https://google.github.io/clusterfuzz (fetched 2026-08-29T08:50:17.307767+00:00, sha 2876af210161)
  - registry_pypi: https://pypi.org/pypi/clusterfuzz/json (fetched 2026-08-29T08:50:17.316650+00:00, sha d12016dc8270)
- Data as of 2026-08-30T08:39:29.467469+00:00.