Individual skill
hunt-race-condition
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 via concurrent requests. Use when hunting race conditions, TOCTOU bugs, MFA-bypass-via-timing.
skills/hunt-race-condition/SKILL.md
Source commit d67cc00d9297a15b9210121e0a93c33f9fb6be46
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 9, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 5,511
- Repository last updated
- Nov 9, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- ai-security Repository topic
- anthropic Repository topic
- application-security Repository topic
- bug-bounty Repository topic
- bugbounty Repository topic
- bugcrowd Repository topic
- claude Repository topic
- claude-code Repository topic
- claude-skills Repository topic
- ethical-hacking Repository topic
- security Derived category
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## 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):
```