http-desync-smuggling SKILL.md skillB
http-desync-smuggling 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/http-desync-smuggling@git:20260820.7bb06b5Pins git:20260820.7bb06b5 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- dreadnode/capabilities
- Path
capabilities/web-security/skills/http-desync-smuggling/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260820.7bb06b5, committed Aug 20, 2026
- Size
- 10,089 bytes
- Repository stars
- 22
- License
- MIT
HTTP request smuggling via body framing disagreements — CL.TE, TE.CL, CL.0, TE obfuscation, duplicate Content-Length, multipart/byteranges confusion, bodyless-method CL, H2-to-H1 downgrade, and escalation to cache poisoning or victim response theft. Covers 11 confirmed mechanism families from production research. Use when testing for request smuggling, body framing confusion, or desync between a proxy and its backend.
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
# HTTP Request Smuggling — Body Framing Desync Request smuggling exploits a disagreement between a front-end (proxy/CDN/WAF) and a back-end (origin) about where one HTTP request ends and the next begins. The attacker's body bleeds into the next request on the shared connection. This skill covers **body framing disagreements** — Content-Length vs Transfer-Encoding conflicts, CL.0, TE obfuscation, duplicate CL, H2 downgrade injection. For CRLF-in-URL-path desync use `response-queue-poisoning`; for TE.0 specifically use `te0-request-smuggling`. ## Tools | Tool | Use | |------|-----| | `desync_fingerprint(host, proxy)` | Which framing primitives the stack accepts — run this first, it eliminates most families | | `desync_build_payload(family, host, path, method)` | Byte-exact raw request for one family; Content-Length and chunk sizes are computed for you | | `desync_probe_cache(host, path, proxy)` | Cache layer detection + which headers are in the cache key | | `desync_analyze_responses(responses, host)` | Classify stolen victim responses and assign severity | Pass `proxy="http://127.0.0.1:8080"` to route probes through Caido. …
Read the whole file at its exact version.
How to install
mdr add dreadnode/capabilities/http-desync-smuggling@sha256:00c165005d4ae26aThe 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_6r6zmlbukmspjf6t)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 20, 2026.
Audit of the latest version
- fail: No link to a raw IP address (matched: http://127.0.0.1:8080)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10089 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 script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
dreadnode/capabilities · 22 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_6r6zmlbukmspjf6t GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/http-desync-smuggling GET https://markdownregistry.com/api/v1/blob/00c165005d4ae26aa402f48d56527c7cd493da9640c28302ebca6caa5bbbd4ba
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.