google/AFL
american fuzzy lop - a security-oriented fuzzer observed · 2026-08-28
Health v2 · maintenance only
10/100
- Activity 0
- Release rhythm 8
- Longevity 100
Flags: archived
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 2596
- days_rel: n/a
- days_push: 1885
- n_releases_24m: 0
Adoption not part of the score
4205 stars · 671 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
American Fuzzy Lop (AFL) is a security-oriented, coverage-guided fuzzer that uses compile-time instrumentation and genetic algorithms to discover inputs triggering new program states and crashes. It is the original classic fuzzer by Michal Zalewski, now largely superseded by the community-maintained AFL++ fork.
Use cases
- fuzz a file parsing library to find crashes
- find memory corruption bugs in a C program
- generate a seed corpus for further security testing
- minimize a crashing test case to its smallest form
- fuzz image decoders or compression libraries for vulnerabilities
When to choose
- you need a proven, simple, low-configuration coverage-guided fuzzer
- you want the classic AFL instrumentation workflow or are following older tutorials
- you need crash triage tools like test case minimization
When to avoid
- you want active development and modern features - use AFL++ instead
- you need structured grammar-aware or in-process fuzzing
- you target platforms beyond Linux/macOS
Facets
cli-tool · maturity maintenance
fuzzing testing security security developer-tools testing cli fuzzer coverage-guided genetic-algorithm instrumentation vulnerability-discovery afl linux macos
3 sources
- readme: https://github.com/google/AFL · fetched 2026-08-28 · d75cbfed2c4e
- homepage: https://lcamtuf.coredump.cx/afl/ · fetched 2026-08-29 · 2ff5dfb5ff44
- site_page: https://lcamtuf.coredump.cx/afl/releases?O=D · fetched 2026-08-29 · cf919af88206
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| google/AFL | main | 10 |
For agents
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem