Public record
Software health reportschema 0.34.0 · metrics 2.10.0 · 2026-08-28 05:37 UTC

google / clusterfuzz

Scalable fuzzing infrastructure.

PythonApache-2.0★ 5,595 stars⑂ 628 forkssince Jan 2019View on GitHub ↗
KindLibraryhow this is determined
#fuzzing#security#stability#vulnerabilities

google/clusterfuzz holds a health index of 34 out of 100, placing it in the At Risk band. It scores highest on Vitality (99/100) and lowest on Security (42/100). It was last updated today. 3 contributors account for most of its recent work.

34
overall / 100
At Risk

Software health index

Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean, calibrated against the distribution of the public record so bands carry percentile meaning; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At Risk ceiling of 34.

34
Exceptional93-100The record's top tier (≈ top 5%); essentially all checked criteria met
Excellent80-92Strong across the board; minor gaps
Good65-79Healthy; gaps are limited and manageable
Moderate50-64Acceptable with notable gaps; review recommended
Weak35-49Material weaknesses across several areas
At Risk20-34Significant weaknesses; adoption warrants caution
Critical1-19Severe problems (abandoned, single-maintainer, no hygiene)
VitalityCommunity &AdoptionSustainability &GovernanceEngineeringQualitySecurityAI Readiness

Score profile

Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.

The weighted overall 80 is calibrated to 94 on the published index scale (record calibration 2026-08-02). High-Risk Jurisdiction Policy applies a 75% multiplier to weighted overall health and gives it an At Risk ceiling of 34.

Ownership

GoogleOrganization · verified domain
77,522 followers2,897 public repossince Jan 2012

This repository is backed by an organization — shared, accountable stewardship that can outlive any single maintainer.

Package ecosystems

RegistryPackageVersionDownloads / moVersionsLast publish
PyPIclusterfuzz2.6.06,886181297 days ago

Metrics by category

Vitality

Is the project alive — is code being written and are releases shipping?

99Exceptional · 21% of overall

Development activity

99Exceptional
How it's scored
36/36Push recency — last push 0 days ago
35.3/36Commit cadence — 51/52 weeks with commits
18/18Commit volume — 333 commits in the last year
10/10OpenSSF Scorecard: Maintained — 30 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
Inputs used
commits_last_year333
human_commit_share1
days_since_last_push0
active_weeks_last_year51

Release discipline

100Exceptional
How it's scored
27/27Ships releases — 100 releases published
36/36Release recency — latest release 0 days ago
27/27Release cadence — a release every ~3.9 days
0/10OpenSSF Scorecard: Signed-Releases — no data
Inputs used
releases_count100
latest_release_tagv2.39.0
releases_from_tagsno
days_since_latest_release0
mean_days_between_releases3.9
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.

Community & Adoption

Does the project have users, downloads, attention, and a welcoming setup for contributors?

84Excellent · 17% of overall

Popularity & adoption

95Exceptional
How it's scored
60/60Stars — 5,595 stars
23.3/25Forks — 628 forks
11.4/15Watchers — 113 watchers
Inputs used
forks628
stars5,595
watchers113
growth_stateunverified
growth_factor_pct100
growth_unverified_reasonno_history

Community health

85Excellent
How it's scored
22.5/22.5README
22.5/22.5License — recognized license (Apache-2.0)
18/18CONTRIBUTING guide
13.5/13.5Code of conduct
0/7.2Issue template
0/6.3PR template
Inputs used
has_readmeyes
has_licenseyes
readme_badges1
has_contributingyes
has_issue_templateno
has_code_of_conductyes
readme_badge_servicesapi.securityscorecards.dev
has_pull_request_templateno

Ecosystem adoption (downloads)

64Moderate
How it's scored
51.2/80Monthly downloads — 6,886 downloads/month across pypi
0/20Registry dependents — not reported by this ecosystem
Inputs used
packagesclusterfuzz
dependents—
ecosystemspypi
total_downloads—
monthly_downloads6,886
unverified_packages_excluded—
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.

Sustainability & Governance

Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?

83Excellent · 23% of overall

Maintainer resilience (bus factor)

77Good
How it's scored
36/54Bus factor — 3 contributor(s) cover half of all commits
17.3/22.5Commit distribution — top contributor authored 23% of commits
13.5/13.5Contributor breadth — 98 contributors
10/10OpenSSF Scorecard: Contributors — project has 13 contributing companies or organizations
Inputs used
bus_factor3
contributors_sampled98
top_contributor_share0.232

Issue & PR responsiveness

85Excellent
How it's scored
39.4/42Issue resolution — 94% of issues closed
25.9/30PR acceptance — 3,894/4,506 decided PRs merged
4.3/13Newcomer PR acceptance — 2/6 first-time contributors' PRs merged in 30d
15/15OpenSSF Scorecard: Code-Review — all changesets reviewed
Inputs used
merged_prs3,894
open_issues54
closed_issues815
prs_merged_7d5
prs_decided_7d8
prs_merged_30d29
prs_decided_30d39
issue_closed_ratio0.938
closed_unmerged_prs612
first_time_authors_30d4
first_time_prs_merged_30d2
first_time_prs_decided_30d6

Ownership & stewardship

100Exceptional
How it's scored
30/30Ownership backing — organization-owned
20/20Verified domain
25/25Owner reach — 77,522 followers of google
25/25Track record — 2,897 public repos, account ~14 yr old
Inputs used
followers77,522
owner_typeOrganization
is_verifiedyes
owner_logingoogle
public_repos2,897
account_age_days5,336

Package maintenance

69Good
How it's scored
25/25Published & resolvable — 1 package(s) on pypi
4/35Publish recency — latest publish 1,297 days ago
20/20Version history — 18 published versions
20/20Not deprecated — active, not deprecated or yanked
Inputs used
packagesclusterfuzz
ecosystemspypi
any_deprecatedno
min_days_since_publish1,297

Engineering Quality

Are baseline engineering and documentation practices in place?

85Excellent · 19% of overall

Engineering practices

82Excellent
How it's scored
24/24CI workflows — 5 workflow(s)
24/24Tests present
16/16Linter config — .pylintrc
0/9.6Pre-commit hooks
0/6.4.editorconfig
18/20OpenSSF Scorecard: CI-Tests — 29 out of 30 merged PRs checked by a CI test -- score normalized to 9
Inputs used
has_ciyes
has_testsyes
has_editorconfigno
has_linter_configyes
has_precommit_configno

Documentation

90Excellent
How it's scored
30/30README
25/25Documentation directory
15/15Documentation / homepage site — https://google.github.io/clusterfuzz
10/10Repository description
10/10Topics — 4 topics
0/10Wiki
Inputs used
topicsfuzzing, security, stability, vulnerabilities
has_wikino
homepagehttps://google.github.io/clusterfuzz
docs_sitehttps://google.github.io/clusterfuzz
has_readmeyes
has_docs_diryes
has_descriptionyes

Security

Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?

42Weak · 16% of overall

Security posture

34At Risk
How it's scored
0/7.5Binary-Artifacts — binaries present in source code
0/7.5Branch-Protection — no data
2.2/2.5CI-Tests — 29 out of 30 merged PRs checked by a CI test -- score normalized to 9
0.5/2.5CII-Best-Practices — badge detected: InProgress
7.5/7.5Code-Review — all changesets reviewed
2.5/2.5Contributors — project has 13 contributing companies or organizations
10/10Dangerous-Workflow — no dangerous workflow patterns detected
7.5/7.5Dependency-Update-Tool — update tool detected
0/5Fuzzing — project is not fuzzed
2.5/2.5License — license file detected
7.5/7.5Maintained — 30 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
0/5Packaging — no data
0/5Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
4.5/5SAST — SAST tool detected but not run on all commits
5/5Security-Policy — security policy file detected
0/7.5Signed-Releases — no data
6.8/7.5Token-Permissions — detected GitHub workflow tokens with excessive permissions
0/7.5Vulnerabilities — 133 existing vulnerabilities detected
Inputs used
sourceopenssf_scorecard
checks_evaluated15
scorecard_versionv5.5.0
checks_inconclusive3
scorecard_aggregate6.6
high_risk_jurisdiction_cap34
high_risk_jurisdiction_multiplier75
security_posture_after_multiplier50
security_posture_before_jurisdiction66
Excluded from scoring (no data or not applicable): Branch-Protection, Packaging, Signed-Releases. Remaining weights renormalized. High-Risk Jurisdiction Policy applies a 75% multiplier and gives Security posture an At risk ceiling of 34.

Dependency advisories

73Good
How it's scored
14/35Direct dependencies free of known advisories — 1 affected: protobuf 3.20.3 (high 7.5)
25/25Indirect dependencies free of known advisories — no indirect dependency carries a known advisory
33.7/40No advisories left outstanding — 1 advisory-carrying package(s) unaddressed past 90 days; oldest published 437 days ago
Inputs used
sourceosv
advisories4
affected_packages1
assessed_packages48
unassessed_packages0
affected_by_severityhigh 1
direct_affected_packages1
Matched the pypi:clusterfuzz@2.6.0 runtime dependency closure — what installing the published package pulls in — 48 packages. Reachability is not analyzed.

AI Readiness

How well is the repo equipped to be developed and maintained with AI coding agents? Carries a deliberately small weight (4%): agent tooling is a real maintenance signal, but a repository with none can still reach 100/100.

69Good · 4% of overall

Agent context & guidance

85Excellent
How it's scored
45/45Agent instructions — AGENTS.md
0/15Machine-readable docs (llms.txt)
40/40Legible commit history — 100 of 100 human commits state their intent (structured subject or explanatory body)
Inputs used
has_llms_txtno
llms_txt_url—
legible_history_share1
agent_instruction_filesAGENTS.md
agent_instruction_max_bytes2,784

Verify loop (build / test / typecheck)

59Moderate
How it's scored
0/18One-command bootstrap
22/22Automated tests
11/11Lint / format config — .pylintrc
11/11Static type checking — pyrightconfig.json
10/10Reproducible environment — devcontainer, Dockerfile, lockfile
0/10Demonstrated agent practice — no agent-authored commits among the last 100
5/8Automated maintenance — dependency automation configured, none observed in the sampled commits
0/10OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0
Inputs used
has_nixno
has_testsyes
lockfilesGemfile.lock, Pipfile.lock
has_dockerfileyes
typed_languageno
bootstrap_files—
has_devcontaineryes
has_linter_configyes
typecheck_configspyrightconfig.json
agent_commit_share0
toolchain_manifests—
dependency_bot_commit_share0

Code legibility for models

81Excellent
How it's scored
27/45Type-checkable code — Python with type-check config (pyrightconfig.json)
54.3/55Manageable file sizes — 10/774 source files over 60KB
Inputs used
primary_languagePython
largest_source_bytes182,132
source_files_sampled774
oversized_source_files10

Machine-readable interfaces

50Moderate
How it's scored
40/40API schema (OpenAPI/GraphQL/proto) — src/clusterfuzz/_internal/protos/heartbeat.proto, src/clusterfuzz/_internal/protos/process_state.proto, src/clusterfuzz/_internal/protos/swarming.proto, src/clusterfuzz/_internal/protos/untrusted_runner.proto, src/clusterfuzz/_internal/protos/uworker_msg.proto
0/20MCP server — not applicable to this kind of software
0/40Runnable examples
Inputs used
example_dirs—
has_mcp_signalno
api_schema_filessrc/clusterfuzz/_internal/protos/heartbeat.proto, src/clusterfuzz/_internal/protos/process_state.proto, src/clusterfuzz/_internal/protos/swarming.proto, src/clusterfuzz/_internal/protos/untrusted_runner.proto, src/clusterfuzz/_internal/protos/uworker_msg.proto
interfaces_expected_of—
Excluded from scoring (no data or not applicable): MCP server. Remaining weights renormalized.

Key facts

5,595GitHub stars
98contributors
333commits, last 12 months
0days since last push
100releases
3bus factor
54open issues
PyPI, RubyGemspackage ecosystems

Data collection warnings

  • Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
  • First-time contributor figures cover 12 of 13 authors (cap 12)

More detail

Star and fork history 0 ★ / 628 ⇿
0Stars
628Forks
98Releases

When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.

01252503755006256101162019-022022-112026-08
Major 0Minor 29Patch 69

Each point covers 7 days.

OpenSSF Scorecard 6.6 / 10
6.6aggregate

Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).Scorecard v5.5.0 · 2026-08-28 05:36 UTC

0Binary-Artifactsbinaries present in source code
n/aBranch-Protectioninternal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md
9CI-Tests29 out of 30 merged PRs checked by a CI test -- score normalized to 9
2CII-Best-Practicesbadge detected: InProgress
10Code-Reviewall changesets reviewed
10Contributorsproject has 13 contributing companies or organizations
10Dangerous-Workflowno dangerous workflow patterns detected
10Dependency-Update-Toolupdate tool detected
0Fuzzingproject is not fuzzed
10Licenselicense file detected
10Maintained30 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10
n/aPackagingpackaging workflow not detected
0Pinned-Dependenciesdependency not pinned by hash detected -- score normalized to 0
9SASTSAST tool detected but not run on all commits
10Security-Policysecurity policy file detected
n/aSigned-Releasesno releases found
9Token-Permissionsdetected GitHub workflow tokens with excessive permissions
0Vulnerabilities133 existing vulnerabilities detected
All dependencies 284

Full resolved dependency set from the GitHub dependency graph: 0 direct and 284 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.

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RubyGemsjekyll-titles-from-headings0.5.3indirect
RubyGemsjekyll-watch2.2.1indirect
RubyGemsjemoji0.12.0indirect
RubyGemsjson2.19.2indirect
RubyGemskramdown2.3.2indirect
RubyGemskramdown-parser-gfm1.1.0indirect
RubyGemsliquid4.0.4indirect
RubyGemslisten3.7.1indirect
RubyGemslogger1.7.0indirect
RubyGemsmercenary0.3.6indirect
RubyGemsmini_portile22.8.9indirect
RubyGemsminima2.5.1indirect
RubyGemsminitest5.27.0indirect
RubyGemsnet-http0.9.1indirect
RubyGemsnokogiri1.19.1indirect
RubyGemsoctokit4.25.1indirect
RubyGemspathutil0.16.2indirect
RubyGemspublic_suffix4.0.7indirect
RubyGemsracc1.8.1indirect
RubyGemsrb-fsevent0.11.1indirect
RubyGemsrb-inotify0.10.1indirect
RubyGemsrexml3.4.2indirect
RubyGemsrouge3.26.0indirect
RubyGemsrubyzip2.3.2indirect
RubyGemssafe_yaml1.0.5indirect
RubyGemssass3.7.4indirect
RubyGemssass-listen4.0.0indirect
RubyGemssawyer0.9.2indirect
RubyGemssecurerandom0.4.1indirect
RubyGemssimpleidn0.2.1indirect
RubyGemsterminal-table1.8.0indirect
RubyGemstyphoeus1.4.0indirect
RubyGemstzinfo2.0.6indirect
RubyGemsunf0.1.4indirect
RubyGemsunf_ext0.0.8.2indirect
RubyGemsunicode-display_width1.8.0indirect
RubyGemsuri1.1.1indirect
RubyGemswebrick1.8.2indirect
Dependency advisories 1

Installing pypi:clusterfuzz@2.6.0 pulls in 48 packages, direct and transitive: 1 carry known advisories, of which 1 are direct dependencies.

PackageVersionRelationSeverityAdvisoriesFixed in
protobuf3.20.3directhigh46.33.5

An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.

Raw JSON report machine-readable

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Related records

Inspected repositories sharing catalogue tags or ecosystems with google/clusterfuzz. Read them side by side →

90pyupio/safetySafety checks Python dependencies for known security vulnerabilities and suggests the proper remediations for vulnerabilities detected.Excellent96AFLplusplus/LibAFLAdvanced Fuzzing Library - Slot your Fuzzer together in Rust! Scales across cores and machines. For Windows, Android, MacOS, Linux, no_std, ...Exceptional96anchore/grypeA vulnerability scanner for container images and filesystemsExceptional90lirantal/npqsafely install npm packages by auditing them pre-install stageExcellent90Keeper-Security/secrets-managerKeeper Secrets Manager is a cloud-based, zero-knowledge platform for securing infrastructure secrets. Provides automatic password rotation and integration into popular DevOps CI/CD tools.Excellent90OWASP/www-project-agent-memory-guardOWASP Foundation web repositoryExcellent

Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.

Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v2.10.0, schema v0.34.0 — full methodology · metrics wiki.

How one result sits in the wider record: aggregate statistics — PyPI.