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libmagic-type-confusion

92 / 100 · Low risk

Fine to try. Some of what it can do is expected: a security skill usually runs scanners and checks websites.

By dreadnode/capabilities (GitHub) · security · 22 stars · scanned at commit 3ceeb34

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.

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'libmagic-type-confusion' ] || [ -L ~/.agents/skills/'libmagic-type-confusion' ]; then echo 'A skill folder named libmagic-type-confusion already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/dreadnode/capabilities' "$d" && git -C "$d" checkout --quiet '3ceeb34c0c33dc36738cf0d4ec86e38b53d98216' -- 'capabilities/web-security/skills/libmagic-type-confusion' && mkdir -p ~/.agents/skills && cp -R "$d"/'capabilities/web-security/skills/libmagic-type-confusion' ~/.agents/skills/'libmagic-type-confusion' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'libmagic-type-confusion' ~/.claude/skills/'libmagic-type-confusion' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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