hunting-http-request-smuggling-and-desync SKILL.md skillA
hunting-http-request-smuggling-and-desync from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/hunting-http-request-smuggling-and-desync@git:20260829.b60f9b2Pins git:20260829.b60f9b2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/hunting-http-request-smuggling-and-desync/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260829.b60f9b2, committed Aug 29, 2026
- Size
- 9,600 bytes
- Repository stars
- 26
- License
- MIT
Hunt for request smuggling where two HTTP processors on the same path disagree about where one request ends and the next begins: a front end and back end that resolve conflicting Content-Length and Transfer-Encoding headers differently, a proxy that forwards a body the origin re-parses, a keep-alive connection where a smuggled prefix poisons the next user's request, and a rewrite or normalization difference that desyncs the stream. Covers chained HTTP/1.1 processors, proxies, load balancers…
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
# Hunting HTTP request smuggling and desync: when two parsers disagree on where a request ends Request smuggling is a disagreement bug, not a parsing bug in isolation. When a request passes through more than one HTTP processor, a proxy or load balancer in front of an origin, each one has to decide where one request ends and the next begins, and if they decide differently, an attacker can hide a second request inside the first. The classic lever is conflicting length signals: a Content-Length and a Transfer-Encoding header, or two of either, that the front end and back end resolve in opposite orders. The consequence is severe because these connections are reused: a smuggled prefix left on a keep-alive connection prepends to the next user's request, so it poisons other people's traffic, bypasses front-end access controls, and captures requests. The hunt is about the seam between two parsers, so you look for where their framing rules differ. You hunt this by finding chained processors and testing whether a crafted request desyncs them. ## When to use - A request passes through more than one HTTP/1.1 processor: a proxy or load balancer in front of an origin. …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/hunting-http-request-smuggling-and-desync@sha256:e3aa5824c8e8f726The line at the top of this page pins the label git:20260829.b60f9b2, 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_agdd455qvse6sumi)
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Versions
The registry has recorded 1 version of this file, committed on Aug 29, 2026.
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 (9600 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
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_agdd455qvse6sumi GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-http-request-smuggling-and-desync GET https://markdownregistry.com/api/v1/blob/e3aa5824c8e8f7267bc8f62ef81ebcc1121e145b3f3c47826699dfa26e212986
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.