# AFLplusplus/AFLplusplus

The fuzzer afl++ is afl with community patches, qemu 5.1 upgrade, collision-free coverage, enhanced laf-intel & redqueen, AFLfast++ power schedules, MOpt mutators, unicorn_mode, and a lot more!

Repository: https://github.com/AFLplusplus/AFLplusplus
Canonical: https://ross.abutalabs.com/products/aflplusplus
Homepage: https://aflplus.plus
Language: C
License: AGPL-3.0
License Family: copyleft
Topics: afl, afl-fuzz, afl-fuzzer, fuzzing, fuzzer, fuzz-testing, instrumentation, qemu, unicorn-emulator, fuzzer-afl, afl-compiler, afl-gcc, unicorn-mode, security, testing
Last push: 2026-08-26T14:41:28+00:00

## Health v2 (maintenance only)
Score: 92/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 78, longevity 100
- inputs: {"age_days": 2654, "days_push": 7, "days_rel": 65, "gap_med": 75, "n_releases_24m": 10}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6736, forks 1317 (observed 2026-08-28T04:09:48.201081+00:00)

## What it is
AFL++ is a superior, actively maintained fork of American Fuzzy Lop, a coverage-guided fuzzer with many mutators, power schedules, and instrumentation modes (LLVM, GCC plugin, QEMU, Unicorn, Frida). It is used to find bugs and vulnerabilities in source-available and binary-only targets.

## Use cases
- fuzz a C/C++ program to find crashes and memory bugs
- fuzz a binary-only target without source code
- discover security vulnerabilities in open-source libraries
- fuzz a native Android library
- run a coverage-guided fuzzing campaign on a file parser
- fuzz a network service or GUI program
- minimize a fuzzing corpus and test cases

## When to choose
- you need a fast, feature-rich coverage-guided fuzzer for C/C++ targets
- you must fuzz binaries without source (QEMU/Unicorn/Frida modes)
- you want the de-facto standard fuzzer used in academic fuzzing research and FuzzBench
- you need custom mutators, power schedules, or CmpLog/Redqueen-style comparisons

## When to avoid
- you need fuzzing for managed languages like Java or Go with native tooling instead
- you want a simple black-box fuzzer with no instrumentation setup
- your target is a web application or API rather than a native binary
- you cannot comply with the AGPL-3.0 license and cannot obtain the commercial license

## Facets
- artifact type: cli-tool
- maturity: active
- function: fuzzing, testing, security, cli
- domain: security, penetration-testing, developer-tools, testing
- platform: windows, bsd, cross-platform, cli
- tags: fuzzer, afl, coverage-guided-fuzzing, qemu-mode, unicorn-mode, frida-mode, cmplog, vulnerability-discovery, instrumentation, linux, macos, android, docker

## Member repositories
- AFLplusplus/AFLplusplus (main) score 92

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:48.201081+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 2026-08-29T17:42:40.292382+00:00, confidence not recorded.
  - readme: https://github.com/AFLplusplus/AFLplusplus (fetched 2026-08-28T04:09:48.201081+00:00, sha f15367971622)
  - homepage: https://aflplus.plus (fetched 2026-08-29T08:38:47.163393+00:00, sha 9ff6f356e9b8)
  - site_page: https://aflplus.plus/features (fetched 2026-08-29T08:38:47.172651+00:00, sha 672e72f17b2f)
  - site_page: https://aflplus.plus/docs (fetched 2026-08-29T08:38:47.176590+00:00, sha 49fcf0670c32)
  - site_page: https://aflplus.plus/docs/tutorials (fetched 2026-08-29T08:38:47.178605+00:00, sha 1d1f50916c50)
  - site_page: https://aflplus.plus/building (fetched 2026-08-29T08:38:47.174727+00:00, sha bd726dd1f0b4)
- Data as of 2026-08-30T08:39:29.467469+00:00.