# microsoft/onefuzz

A self-hosted Fuzzing-As-A-Service platform

Repository: https://github.com/microsoft/onefuzz
Canonical: https://ross.abutalabs.com/products/onefuzz
Language: C#
License: MIT
License Family: permissive
Archived: true
Last push: 2023-11-01T09:22:49+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2228, "days_push": 1036, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2824, forks 203 (observed 2026-08-28T04:07:24.127477+00:00)

## What it is
OneFuzz is a self-hosted Fuzzing-As-A-Service platform that lets developers launch continuous fuzzing jobs from a few VMs to thousands of cores, with built-in ensemble fuzzing, crash triage, and de-duplication. It was open sourced by Microsoft but was archived in late 2023 as development moved to an internal service.

## Use cases
- run fuzzing at scale in ci/cd
- find crashes in my software automatically
- self-host a fuzzing service
- triage and dedupe fuzzing crashes
- run ensemble fuzzing across fuzzers
- debug crashes found by fuzzers on demand

## When to choose
- you need scalable, developer-driven fuzzing integrated into CI/CD on Windows or Linux
- you want programmatic crash triage, de-duplication, and notification callbacks
- you're comfortable forking and maintaining the project yourself

## When to avoid
- you want an actively maintained project - it was archived in September 2023
- you need turnkey hosted fuzzing without self-managing Azure infrastructure
- you only need a simple local fuzzer rather than an orchestration platform

## Facets
- artifact type: service
- maturity: abandoned
- function: fuzzing, testing, ci-cd, deployment
- domain: security, developer-tools, testing
- platform: windows, cloud, self-hosted
- tags: fuzzing-as-a-service, security-testing, crash-triage, ensemble-fuzzing, microsoft, archived, linux, docker

## Member repositories
- microsoft/onefuzz (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:24.127477+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 2026-08-30T07:38:15.410003+00:00, confidence not recorded.
  - readme: https://github.com/microsoft/onefuzz (fetched 2026-08-28T04:07:24.127477+00:00, sha e4731818c6d6)
- Data as of 2026-08-30T08:39:29.467469+00:00.