---
title: "LibAFL - Air Market"
description: "Sometimes the target you want to fuzz does not fit any ready-made fuzzer, and you need to assemble one yourself. LibAFL is a library made of parts for exactly that, and this covers working with it. R…"
canonical: "https://airmarket.ai/app/libafl"
---

[Air Market](/) / [Security](/category/security) / LibAFL

Skill by [Trail of Bits](/@trailofbits)

# LibAFL

For fuzzing jobs that no off-the-shelf fuzzer fits

## What this does

Sometimes the target you want to fuzz does not fit any ready-made fuzzer, and you need to assemble one yourself. LibAFL is a library made of parts for exactly that, and this covers working with it. Reach for it when the standard approach has run out and you need custom mutators or a non-standard target.

### Top 3 things it does for you

- Build a fuzzer of your own
- Write a custom mutator
- Fuzz a target the standard tools do not handle

## Information

**LibAFL at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [Trail of Bits](/@trailofbits) |
| Category | [Security](/category/security) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Size | 20 KB |
| Licence | CC-BY-SA-4.0 |
| Repository | [trailofbits/skills](https://github.com/trailofbits/skills/tree/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/libafl) |
| GitHub stars | 6,823 (as of Nov 2026) |
| Installs | 5,522, counted by skills.sh (Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of LibAFL and flagged nothing. AIR's verdict: **safe**.

**What LibAFL's check was run against**

|  |  |
| --- | --- |
| Commit | d5fe2e6a7896236c3102fd5477e833623ad70298 |
| Content hash | 5a2799ecb5994bcff2ae0992d1aec1f5849e40e9bece64cdee5d2e240f195ab8 |
| Files read | [Browse the files at this exact commit](https://github.com/trailofbits/skills/blob/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/libafl/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for LibAFL](/security/libafl)

## About LibAFL

LibAFL is a modular fuzzing library for building custom fuzzers.

It is the option for advanced fuzzing needs, custom mutators, or targets that the non-standard label fits.

## What's inside

- SKILL.md - instructions
- agents/openai.yaml - data
- assets/trail-of-bits-mark.svg - template

## Questions

### Is LibAFL safe to install?

AIR scanned this exact version of LibAFL and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit d5fe2e6a7896, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/libafl.

### How do I install LibAFL?

Open https://airmarket.ai/app/libafl on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/trailofbits/skills/tree/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/libafl. Install from that link, not the branch.

## Related on Air Market

- [More Security listings](/category/security)
- [Everything by Trail of Bits](/@trailofbits)

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Canonical URL: <https://airmarket.ai/app/libafl>