dreadnode/capabilities · capabilities/web-security/skills/libmagic-type-confusion/SKILL.md

libmagic-type-confusion skillA

libmagic-type-confusion is agent-read markdown (skill) from dreadnode/capabilities: Bypass file type detection using libmagic's JSON nesting depth limit to force type confusion. Use when file uploads validate type via libmagic or the file command and you need to smuggle executable content past MIME checks..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add dreadnode/capabilities/libmagic-type-confusion@git:20260529.8f6ea0e
Exact content
mdr add dreadnode/capabilities/libmagic-type-confusion@sha256:d38d47a05c9e13b0

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_2635r4femslusgza.svg)](https://markdownregistry.com/a/art_2635r4femslusgza)

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Versions

versioncommittedcommitsizeaudit
git:20260529.8f6ea0e latest2026-05-29 8f6ea0e 3,120 BA view · diff
git:20260504.2a643742026-05-04 2a64374 2,920 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (3120 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

dreadnode/capabilities · 15 stars · license none · pushed 2026-09-18 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_2635r4femslusgza
GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/libmagic-type-confusion
GET https://markdownregistry.com/api/v1/blob/d38d47a05c9e13b0c26912678ca52bae29139e1e3a86f3064d3d7fa91e60cfe6

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.