response-queue-poisoning SKILL.md skillA
response-queue-poisoning from dreadnode/capabilities is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add dreadnode/capabilities/response-queue-poisoning@git:20260820.7bb06b5Pins git:20260820.7bb06b5 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dreadnode/capabilities
- Path
capabilities/web-security/skills/response-queue-poisoning/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260820.7bb06b5, committed Aug 20, 2026
- First version recorded
- Aug 12, 2026
- Size
- 7,598 bytes
- Repository stars
- 22
- License
- MIT
Escalate HTTP header injection (CRLF in URL path or parameters) to critical impact via response queue poisoning and request tunnelling — smuggle requests through persistent connections to capture victim responses or bypass proxy ACLs. Use when CRLF injection exists in request headers/path and front-end maintains persistent backend connections.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# CRLF-Powered Desync Attacks Inject `%0d%0a` in URL paths or parameters to smuggle complete HTTP requests through persistent connections. Two exploitation modes: - **Response queue poisoning** — proxy reuses connections across users: smuggled request offsets the response queue, attacker receives victim's response - **Request tunnelling** — proxy does NOT reuse connections: smuggled request bypasses proxy-layer ACLs to reach blocked endpoints directly ## When to Use - CRLF injection confirmed (or suspected) in URL path, query parameter, or request header - Front-end proxy + back-end with persistent upstream connections - Standard CL.TE/TE.CL/TE.0 smuggling failed — this needs no Content-Length/Transfer-Encoding disagreement - `crlf-response-splitting` already considered (that skill targets CSP bypass XSS via response headers; this targets request pipeline desync) ## Phase 1: Detect CRLF Injection — Differential Probing …
Read the whole file at its exact version.
How to install
mdr add dreadnode/capabilities/response-queue-poisoning@sha256:aff2e2bd971b2672The line at the top of this page pins the label git:20260820.7bb06b5, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_yk73mofd63uzy5ii)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Aug 12, 2026 and Aug 20, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260820.7bb06b5 latest | 2026-08-20 | 7bb06b5 | 7,598 B | A | view · diff |
| git:20260812.6f80ddf | 2026-08-12 | 6f80ddf | 7,501 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7598 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
dreadnode/capabilities · 22 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_yk73mofd63uzy5ii GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/response-queue-poisoning GET https://markdownregistry.com/api/v1/blob/aff2e2bd971b2672f694e932e57eeb6903b60f71449d62ce4b241254091071be
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.