hunt-race-condition

92 / 100 · Low risk

Fine to try. Some of what it can do is expected: a security skill usually runs scanners and checks websites.

By elementalsouls/Claude-BugHunter (GitHub) · security · 5,515 stars · scanned at commit d5dcc53

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 …

Works with any agent that supports SKILL.md skills.

What this skill can do

Runs commands on your computer

The author does not mention this. Expected for a security skill.

Found in 3 places.

skills/hunt-race-condition/SKILL.md, line 141for i in $(seq 1 15); do
skills/hunt-race-condition/SKILL.md, line 177grep -rn "find_by\|where.*first" --include="*.rb" | grep -v "lock"
skills/hunt-race-condition/SKILL.md, line 190curl -sI --http2 https://target.com | grep -i "HTTP/2\|h2"

Sends data to these websites: target.com

This is disclosed by the author in the skill's SKILL.md or README. Expected for a security skill.

Found in 4 places.

skills/hunt-race-condition/SKILL.md, line 142curl -s -o /dev/null -w "%{http_code}\n" \
skills/hunt-race-condition/SKILL.md, line 164async with aiohttp.ClientSession() as session:
skills/hunt-race-condition/SKILL.md, line 190curl -sI --http2 https://target.com | grep -i "HTTP/2\|h2"

Show 1 more

skills/hunt-race-condition/SKILL.md, line 385Detect h2.0 viability via `curl -sI --http2 https://target.com | grep -i HTTP/2`. If the server doesn't speak h2, single-packet is not directly applicable — fal

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'hunt-race-condition' ] || [ -L ~/.agents/skills/'hunt-race-condition' ]; then echo 'A skill folder named hunt-race-condition already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/elementalsouls/Claude-BugHunter' "$d" && git -C "$d" checkout --quiet 'd5dcc5347675ed431488e0a0e46749e4918aa194' -- 'skills/hunt-race-condition' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/hunt-race-condition' ~/.agents/skills/'hunt-race-condition' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'hunt-race-condition' ~/.claude/skills/'hunt-race-condition' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-10	`d5dcc53`	92
2026-11-08	`42a3ab1`	92
2026-11-06	`3e71af0`	92