h2-waf-bypass SKILL.md skillA
h2-waf-bypass 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/h2-waf-bypass@git:20260605.b7969f8Pins git:20260605.b7969f8 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/h2-waf-bypass/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260605.b7969f8, committed Jun 5, 2026
- First version recorded
- Jun 5, 2026
- Size
- 11,042 bytes
- Repository stars
- 22
- License
- MIT
Bypass WAF body/path inspection via HTTP/2 binary framing — delayed DATA frames blind out-of-process WAFs, body size truncation evades ext_authz limits, Extended CONNECT converts methods past ACLs. Includes black-box proxy+WAF fingerprinting. Use when WAF blocks payloads over HTTP/1.1 but target supports HTTP/2, or when standard 403-bypass and parser-differential techniques fail.
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
# H2 WAF Bypass via Binary Framing HTTP/2 splits requests into binary frames: method/path arrive in HEADERS frames, body arrives in DATA frames. Out-of-process WAFs (SPOA, ext_authz, ForwardAuth) evaluate at HEADERS time. If DATA arrives later, the body is invisible to the WAF but reaches the backend. In-process WAFs (libmodsecurity3 in nginx) buffer the full request before evaluation. These are NOT vulnerable to frame timing attacks. ## When to Use - WAF blocks your payload over HTTP/1.1 (403 on body content, path, or method) - Target accepts HTTP/2 (check ALPN or force H2 connection preface) - Standard `403-bypass` path/header tricks exhausted - `parser-differential-bypass` content-type tricks exhausted - `h2c-websocket-smuggling` upgrade path not available ## Phase 1: Proxy + WAF Fingerprinting Identify the proxy and WAF architecture before choosing an attack. Run the bundled PoC (`scripts/h2_waf_bypass.py`) or manually fingerprint. ### Signal 1: Response Headers ```bash curl -sk -D- https://TARGET/ -o /dev/null 2>&1 | grep -iE "^(server|via|alt-svc|x-envoy)" ``` | Header | Proxy | |--------|-------| | `server: envoy` or `x-envoy-*` | Envoy | …
Read the whole file at its exact version.
How to install
mdr add dreadnode/capabilities/h2-waf-bypass@sha256:924aa1ec4d2dcc6dThe line at the top of this page pins the label git:20260605.b7969f8, 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_icemg7atum5vgpun)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, all committed on Jun 5, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260605.b7969f8 latest | 2026-06-05 | b7969f8 | 11,042 B | A | view · diff |
| git:20260605.8973360 | 2026-06-05 | 8973360 | 11,161 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 (11042 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_icemg7atum5vgpun GET https://markdownregistry.com/api/v1/resolve?ref=dreadnode/capabilities/h2-waf-bypass GET https://markdownregistry.com/api/v1/blob/924aa1ec4d2dcc6d72e2d1b13358c7be3e491a9dc700d43220df514b13e8d694
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.