hunt-race-condition SKILL.md skillA
hunt-race-condition from novaestellar/novahaku is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add novaestellar/novahaku/hunt-race-condition@git:20260910.546fe86Pins git:20260910.546fe86 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- novaestellar/novahaku
- Path
testing/hunt/hunt-race-condition/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260910.546fe86, committed Sep 10, 2026
- First version recorded
- Sep 3, 2026
- Size
- 35,454 bytes
- Repository stars
- 28
- License
- MIT
Hunting skill for race condition vulnerabilities. Built from 12 public bug bounty reports including modern HTTP/2 single-packet attack cases (James Kettle DEF CON 2023 "Smashing the State Machine"; RyotaK / Flatt Security 10,000-request first-sequence-sync expansion 2024). Covers coupon double-redemption, gift-card double-spend, MFA-OTP-validate race, account-create race, faucet/crypto token double-mint, email-activation race, vote/upvote inflation, password-reset token race, rate-limit bypass…
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
## Firing a race — two primitives (tooling-agnostic) Winning a race needs requests that arrive in the *same* narrow window — sequential sends never work. Use a single-packet / synchronized-send tool: **Burp Repeater** "Send group in parallel" (HTTP/2 single-packet attack), **Turbo Intruder** (`engine=Engine.BURP2`, `gate` sync), or any client that can flush N requests simultaneously. Two shapes: - **Identical-copies race** — fire N IDENTICAL copies of one request at once (limit-overrun: double-spend a coupon/gift-card, exceed a one-per-user quota). Success = ≥2 of the N return 2xx. - **Different-requests race (partial construction)** — fire a LIST of DIFFERENT requests in one synchronized window, repeated over several rounds. For register-then-confirm / TOCTOU races where the object exists in a usable state mid-creation. Example (email-verification bypass — register an arbitrary email, then confirm it through the construction window with a blank token): ``` Request A: POST /register body: csrf=<csrf>&username=hacker&email=anything@exploit.net&password=pw Request B: GET /confirm params: token= (empty) Fire A and B together, repeat ~20 rounds. ``` …
Read the whole file at its exact version.
How to install
mdr add novaestellar/novahaku/hunt-race-condition@sha256:49965893e3a77c19The line at the top of this page pins the label git:20260910.546fe86, 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_hq5yzci7aabd6g2t)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 3, 2026 and Sep 10, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260910.546fe86 latest | 2026-09-10 | 546fe86 | 35,454 B | A | view · diff |
| git:20260903.29924dd | 2026-09-03 | 29924dd | 35,466 B | A | view · diff |
| git:20260903.fa855c4 | 2026-09-03 | fa855c4 | 35,437 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 (35454 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
novaestellar/novahaku · 28 stars · license MIT · pushed 2026-09-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_hq5yzci7aabd6g2t GET https://markdownregistry.com/api/v1/resolve?ref=novaestellar/novahaku/hunt-race-condition GET https://markdownregistry.com/api/v1/blob/49965893e3a77c1993411af6d9631bd98f872ae8ea21ff2e1f6579a5de14678b
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.
More from novaestellar/novahaku
Every file in novaestellar/novahaku