unboundcompute/security-agent-skills · skills/hunting-host-header-and-url-parsing-trust/SKILL.md

hunting-host-header-and-url-parsing-trust skillA

hunting-host-header-and-url-parsing-trust is agent-read markdown (skill) from unboundcompute/security-agent-skills: Hunt trust placed in the Host or a forwarded host header and in inconsistently parsed URLs, where the app builds absolute links, keys a cache, routes a request, or matches an allowlist from a header or a parsed URL an attacker can influence or that two components parse differently. Use when a service derives its own external URL from the request, when a cache or router keys on the host, or when a security decision parses a URL. Covers password-reset and verification-link poisoning, cache poisoni.

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-host-header-and-url-parsing-trust@git:20260903.6dac719
Exact content
mdr add unboundcompute/security-agent-skills/hunting-host-header-and-url-parsing-trust@sha256:b46af7f9063cdc0b

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_ltmifren7hiuzxt2.svg)](https://markdownregistry.com/a/art_ltmifren7hiuzxt2)

0 badge views in 30 days

Versions

versioncommittedcommitsizeaudit
git:20260903.6dac719 latest2026-09-03 6dac719 10,585 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 (10585 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_ltmifren7hiuzxt2
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-host-header-and-url-parsing-trust
GET https://markdownregistry.com/api/v1/blob/b46af7f9063cdc0b7a8b3aac9fc6a02be1c0fb8239d0b438b8ae441b22c8fa5d

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