# AFLplusplus/LibAFL

Advanced Fuzzing Library - Slot your Fuzzer together in Rust! Scales across cores and machines. For Windows, Android, MacOS, Linux, no_std, ...

Repository: https://github.com/AFLplusplus/LibAFL
Canonical: https://ross.abutalabs.com/products/libafl
Language: Rust
License: NOASSERTION
License Family: other
Topics: afl, afl-fuzz, aflplusplus, fuzzing, coverage-guided, binary-only, frida, rust, libafl, fuzzing-framework
Last push: 2026-08-26T17:17:33+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 85, longevity 100
- inputs: {"age_days": 2141, "days_push": 7, "days_rel": 22, "gap_med": 49.5, "n_releases_24m": 9}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2622, forks 480 (observed 2026-08-28T04:07:05.093393+00:00)

## What it is
LibAFL is a Rust library of reusable building blocks for constructing custom coverage-guided fuzzers, developed by the AFL++ team. It scales across cores and machines via its LLMP message-passing layer and supports instrumentation backends including SanitizerCoverage, Frida, QEMU, and TinyInst.

## Use cases
- build a custom coverage-guided fuzzer in Rust
- fuzz binary-only targets without source code using Frida or QEMU
- scale fuzzing across multiple cores and machines
- fuzz embedded or no_std targets like hypervisors
- instrument targets with SanitizerCoverage or custom backends
- fuzz structured inputs with AST-based input formats

## When to choose
- you need a highly customizable fuzzer beyond what off-the-shelf tools like AFL++ offer
- you want to fuzz binary-only targets via Frida, QEMU, or TinyInst
- you need multi-platform fuzzing including Windows, macOS, Android, or no_std environments
- you want near-linear scaling across cores and machines

## When to avoid
- you just want to run a fuzzer with minimal setup - use AFL++ or another off-the-shelf fuzzer instead
- your team does not know Rust and cannot write custom fuzzer code
- you need a GUI-driven fuzzing workflow

## Facets
- artifact type: library
- maturity: active
- function: fuzzing, testing, security
- domain: security, developer-tools, testing
- platform: windows, rust, cross-platform
- tags: coverage-guided-fuzzing, afl, frida, qemu, no-std, binary-only-fuzzing, fuzzing-framework, linux, macos, android, ios

## Member repositories
- AFLplusplus/LibAFL (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:05.093393+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 2026-08-30T02:19:59.394739+00:00, confidence not recorded.
  - readme: https://github.com/AFLplusplus/LibAFL (fetched 2026-08-28T04:07:05.093393+00:00, sha 304dbed6e2e5)
  - registry_crates: https://crates.io/api/v1/crates/libafl (fetched 2026-08-29T10:02:56.739716+00:00, sha f81d369fe7f6)
- Data as of 2026-08-30T08:39:29.467469+00:00.