Home / novaestellar / novahaku · GitHub

hunt-http-smuggling SKILL.md skillA

hunt-http-smuggling from novaestellar/novahaku is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add novaestellar/novahaku/hunt-http-smuggling@git:20260923.6f7e0fc

Pins git:20260923.6f7e0fc in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: novaestellar/novahaku
Path: testing/hunt/hunt-http-smuggling/SKILL.md
Versions recorded: 4
Latest version: git:20260923.6f7e0fc, committed Sep 23, 2026
First version recorded: Sep 3, 2026
Size: 6,445 bytes
Repository stars: 28
License: MIT

Hunt HTTP request smuggling (CL.TE, TE.CL, H2.CL, H2.TE). Cause: front-end proxy and back-end server disagree on where one request ends and the next begins (Content-Length vs Transfer-Encoding header parsing inconsistency). CL.TE: front-end uses CL, back uses TE → smuggle by sending TE: chunked but with body that fits CL count. TE.CL: opposite. H2.CL: HTTP/2 downgrade, smuggle CL into HTTP/1.1 back-end. Detection tools: Burp HTTP Request Smuggler extension, smuggler.py, h2csmuggler. Confirm…

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

## 17. HTTP REQUEST SMUGGLING
> Lowest dup rate. $5K–$30K. PortSwigger research by James Kettle.

### CL.TE (Content-Length front, Transfer-Encoding back)
```http
POST / HTTP/1.1
Content-Length: 13
Transfer-Encoding: chunked

0

SMUGGLED
```

### Detection
```
1. Burp extension: HTTP Request Smuggler
2. Right-click request → Extensions → HTTP Request Smuggler → Smuggle probe
3. Manual timing: CL.TE probe + ~10s delay = backend waiting for rest of body
```

### Impact Chain
```
Poison next request → access admin as victim
Steal credentials → capture victim's session
Cache poisoning → stored XSS at scale
```

---

## Target-Suitability Matrix (2026 reality check)

The classic CL.TE / TE.CL payloads are NOT universally exploitable in 2026. Modern proxies are RFC 9112 strict by default. Fingerprint the front-end BEFORE investing time.

| Front-end | CL.TE | TE.CL | H2.CL | H2.TE | Notes |
|---|---|---|---|---|---|
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add novaestellar/novahaku/hunt-http-smuggling@sha256:314918445c06590c

The line at the top of this page pins the label git:20260923.6f7e0fc, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_ckt74p5d7rt5kqc3.svg)](https://markdownregistry.com/a/art_ckt74p5d7rt5kqc3)

3 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 4 versions of this file, between Sep 3, 2026 and Sep 23, 2026, about one every 7 days.

version	committed	commit	size	audit
git:20260923.6f7e0fc latest	2026-09-23	6f7e0fc	6,445 B	A	view · diff
git:20260910.546fe86	2026-09-10	546fe86	6,455 B	A	view · diff
git:20260903.29924dd	2026-09-03	29924dd	6,467 B	A	view · diff
git:20260903.fa855c4	2026-09-03	fa855c4	6,438 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the 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 (6445 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

novaestellar/novahaku · 28 stars · license MIT · pushed 2026-09-28 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_ckt74p5d7rt5kqc3
GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/hunt-http-smuggling
GET https://markdownregistry.com/api/v1/blob/314918445c06590c130173abf24ee0365e29e811e0943668c4380e881bd55505

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.

More from novaestellar/novahaku

novahaku SKILL.md skill

novaestellar/novahaku · SKILL.md · Novahaku — 统一安全研究代理。Web测试、提示工程、攻击框架、逆向工程、请求重构、OSINT侦察、CTF竞赛、源码猎人、MCP工具集成。所有能力,单一技能,自动检测。与novaxinwei(v1.1)协同…

v4.1.0 · audit A · 28 stars

docs-generator SKILL.md skill

novaestellar/novahaku · docs/docs-generator/SKILL.md · Creates task-oriented technical documentation with progressive disclosure. Use when writing READMEs, API docs…