AFL++

github.com

What it is

AFL++ is a coverage-guided fuzzer that mutates input and checks whether it reaches a new path in the target binary.

From github.com's own pages, read 28 Sept 2026.

AGPL-3.0-or-laterUse, study, modify, and distribute under AGPL terms · modified network services must offer corresponding sourceFree
Commercial licenseDonation to EFF or CCC; license lasts one year and can be renewed by donating again · For organizations that cannot or do not want to…€20,000 a year

As github.com lists them, read 28 Sept 2026.

Data plate

Price: Free · paid from €1,666.67 a month
Free plan: Yes
Free trial: Not stated
Runs on: Android, Linux, macOS, self-hosted, Windows
Open source: No
Website: github.com
Build modes: Build targets include source-only fuzzing, binary-only fuzzing, or a distribution build with both.
Compiler instrumentation: Its central afl-cc compiler supports LTO, LLVM, and GCCPLUGIN instrumentation modes.
Container image: The project provides a Docker image for x8664 and arm64, with the target source mounted at /src in its example command.
Founded: 2019
Hardware and storage limits: The project warns that fuzzing can strain hardware, consume large amounts of memory or disk, and generate heavy filesystem I/O.
License exceptions: Individual source files marked Apache-2.0 may be reused under that license, while bundled third-party components retain their own licenses.
License obligations: The combined afl-fuzz program is AGPL as a whole, and modified versions offered as network services must offer users the corresponding source.
Linux requirements: The installation guide recommends LLVM 18 or newer and gives LLVM 14 as the minimum.
Checked: 28 Sept 2026

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