unboundcompute/security-agent-skills · skills/hunting-content-type-and-parser-confusion/SKILL.md

hunting-content-type-and-parser-confusion skillA

hunting-content-type-and-parser-confusion is agent-read markdown (skill) from unboundcompute/security-agent-skills: Hunt content-type sniffing and parser confusion where untrusted content is served or consumed with an ambiguous or attacker-influenced type, so a browser sniffs a response as HTML, a backend picks a different interpretation than the sender intended, or two parsers on one path disagree. Use when user content is echoed with a missing, wrong, or user-controlled content type, when uploads are typed by extension or by the client, or when a request body can be parsed more than one way. Covers response.

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 unboundcompute/security-agent-skills/hunting-content-type-and-parser-confusion@git:20260903.6dac719
Exact content
mdr add unboundcompute/security-agent-skills/hunting-content-type-and-parser-confusion@sha256:27a4659e6b0ba40e

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_mxhm2qahslwkisme.svg)](https://markdownregistry.com/a/art_mxhm2qahslwkisme)

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Versions

versioncommittedcommitsizeaudit
git:20260903.6dac719 latest2026-09-03 6dac719 9,911 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 (9911 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

unboundcompute/security-agent-skills · 5 stars · license MIT · pushed 2026-09-08 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_mxhm2qahslwkisme
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-content-type-and-parser-confusion
GET https://markdownregistry.com/api/v1/blob/27a4659e6b0ba40ecd8233926a515e17cfcc4adade9ebefca6019a2148038df1

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