Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add adriannoes/awesome-agentic-ai --skill hunt-http-smugglinggit clone --depth 1 https://github.com/adriannoes/awesome-agentic-aiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/adriannoes/awesome-agentic-ai/hunt-http-smuggling)<a href="https://agentmods.dev/skills/adriannoes/awesome-agentic-ai/hunt-http-smuggling"><img src="https://agentmods.dev/badge/skills/adriannoes/awesome-agentic-ai/hunt-http-smuggling/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/adriannoes/awesome-agentic-ai/hunt-http-smuggling"><img src="https://agentmods.dev/badge/skills/adriannoes/awesome-agentic-ai/hunt-http-smuggling.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00242 | $0.01632 |
| Opus 5 | $0.00121 | $0.00816 |
| Sonnet 5 | $0.00048 | $0.00326 |
| Haiku 4.5 | $0.00024 | $0.00163 |
Grade A, and why
hunt-http-smuggling scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sI https://target/ | grep -i "Server:" How it starts
The opening of the file, as written. The whole thing — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.
17. HTTP REQUEST SMUGGLING
Lowest dup rate. $5K–$30K. PortSwigger research by James Kettle.
CL.TE (Content-Length front, Transfer-Encoding back)
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 |
|---|---|---|---|---|---|
| Nginx ≥ 1.21 | NO | NO | partial (H2 ingress) | partial | RFC-strict; rejects CL+TE with HTTP 400. Verified locally on Nginx 1.27 — all 9 documented variants killed by front-end (docs/verification/phase2h-smuggling-cachepoison.md). |
| Caddy 2.x | NO | NO | — | — | Hardened by default |
| Envoy ≥ 1.20 | NO | NO | partial | partial | Hardened in most paths |
| HAProxy ≤ 2.4 | ✓ | ✓ | — | — | Vulnerable, see CVE-2021-40346 |
| AWS ALB + specific upstream | partial | partial | ✓ | ✓ | Several disclosed-paid reports 2022-2024 |
| Cloudflare → S3 / Lambda chains | — | — | ✓ | ✓ | H2-downgrade attacks remain viable |
| Older F5 BIG-IP (TMM < 16) | ✓ | — | — | — | Vendor advisories |
| Citrix ADC / NetScaler (older firmware) | ✓ | ✓ | — | — | Disclosed in 2020-2022 |
| Squid 3.x | ✓ | — | — | — | Older deployments |
| Apache Traffic Server (older) | ✓ | ✓ | ✓ | ✓ | PortSwigger research |
| Custom Python / Go proxies | ✓ | ✓ | — | — | Frequently miss RFC enforcement |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 7d ago First seen · 82 lines · 242 tokens per session scan A 9b2bac180074
hunt-http-smuggling is a skill published in the GitHub repository adriannoes/awesome-agentic-ai (57 stars, last pushed 13d ago), licensed MIT. It adds 242 tokens to every session and 1,632 once invoked, about $0.0012 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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