# rust-fuzz/afl.rs

🐇 Fuzzing Rust code with American Fuzzy Lop

Repository: https://github.com/rust-fuzz/afl.rs
Canonical: https://ross.abutalabs.com/products/aflrs
Homepage: https://rust-fuzz.github.io/book/afl.html
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: rust, fuzz-testing, afl, fuzzing
Last push: 2026-08-10T08:26:11+00:00

## Health v2 (maintenance only)
Score: 76/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 35, longevity 100
- inputs: {"age_days": 4165, "days_push": 23, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1840, forks 119 (observed 2026-08-28T04:05:43.033867+00:00)

## What it is
afl.rs is a Cargo subcommand that lets you fuzz test Rust code with AFLplusplus, the coverage-guided fuzzer. It instruments Rust builds so AFLplusplus can find crashes and security issues in Rust programs.

## Use cases
- fuzz test my rust crate for crashes
- find security vulnerabilities in rust code with afl
- run coverage-guided fuzzing on a rust binary
- discover panics in rust parsers with random input
- set up continuous fuzzing for a rust project

## When to choose
- you want to fuzz Rust code with AFLplusplus's mature coverage-guided engine
- you prefer a simple cargo-integrated fuzzing workflow
- you want CMPLOG and other AFL++ features on Rust targets

## When to avoid
- you need structure-aware fuzzing with libFuzzer-style custom mutators (consider cargo-fuzz instead)
- you are fuzzing non-Rust code
- you need Windows support, which is not a primary target

## Facets
- artifact type: cli-tool
- maturity: active
- function: fuzzing, testing, cli, developer-tools
- domain: security, testing, developer-tools, programming-languages
- platform: rust, cli
- tags: aflplusplus, fuzz-testing, cargo, coverage-guided-fuzzing, linux, macos

## Member repositories
- rust-fuzz/afl.rs (main) score 76

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:43.033867+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 2026-08-30T03:18:05.504265+00:00, confidence not recorded.
  - readme: https://github.com/rust-fuzz/afl.rs (fetched 2026-08-28T04:05:43.033867+00:00, sha e6c2f5c383c9)
  - homepage: https://rust-fuzz.github.io/book/afl.html (fetched 2026-08-29T10:57:13.024542+00:00, sha 83f014a316f3)
- Data as of 2026-08-30T08:39:29.467469+00:00.