http2-specific-attacks

A guide for testing security weaknesses specific to HTTP/2, the web protocol that sends requests using binary frames and multiple streams over one connection.

In plain words
What is it for?
Use it when a target supports HTTP/2 and authorised testing needs to examine request smuggling, header handling, connection upgrades, stream behaviour, or HTTP/2-to-HTTP/1 translation.
Why use it?
It helps testers examine problems caused by differences between HTTP/2, proxies, web servers, and older HTTP/1 systems.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/prohao42/aimy-skill/http2-specific-attacks
Any agent
npx skills add Prohao42/aimy-skill --skill http2-specific-attacks
Clone the repo
git clone --depth 1 https://github.com/Prohao42/aimy-skill

Made for: Claude Code, Codex.

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,188 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00061 $0.03188
Opus 5 $0.00030 $0.01594
Sonnet 5 $0.00012 $0.00638
Haiku 4.5 $0.00006 $0.00319

Measured 2d ago against content hash b02b678fe8e7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

http2-specific-attacks 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 2d 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 -v --http1.1 https://target.com/ \
ai-mian/hack-skills/skills/http2-specific-attacks/SKILL.md · 351 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

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.

  1. 2d ago First seen · 351 lines · 61 tokens per session scan A b02b678fe8e7

Subscribe to this mod's changes

http2-specific-attacks is a skill published in the GitHub repository Prohao42/aimy-skill (135 stars, last pushed 8d ago), with no licence file. It adds 61 tokens to every session and 3,188 once invoked, about $0.0003 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 2026-08-30.

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