unboundcompute/security-agent-skills · skills/hunting-crlf-and-response-splitting/SKILL.md

hunting-crlf-and-response-splitting skillA

hunting-crlf-and-response-splitting is agent-read markdown (skill) from unboundcompute/security-agent-skills: Hunt CRLF injection where untrusted input carrying a carriage return and line feed reaches a response header, a log line, or an outbound email header that does not strip or reject those characters, letting the attacker inject headers, split the message, forge log entries, or add email headers. Use when input flows into a Set-Cookie, Location, or custom response header, into a log written from request data, or into mail headers built from user input. Covers full response splitting into injected c.

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-crlf-and-response-splitting@git:20260903.6dac719
Exact content
mdr add unboundcompute/security-agent-skills/hunting-crlf-and-response-splitting@sha256:76d4ad59e2b3a257

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_cwgecz633e4edqwp.svg)](https://markdownregistry.com/a/art_cwgecz633e4edqwp)

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Versions

versioncommittedcommitsizeaudit
git:20260903.6dac719 latest2026-09-03 6dac719 9,819 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 (9819 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_cwgecz633e4edqwp
GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-crlf-and-response-splitting
GET https://markdownregistry.com/api/v1/blob/76d4ad59e2b3a25775540ac3fe1ec252a081fb633729baaece7e273b2a0f85a1

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