hunt-race-condition

To test for race condition vulnerabilities, identify high-value one-time action endpoints and execute controlled parallel requests to detect duplicate effects like double-spending or unauthorized votes caused by non-atomic state updates.

Look for race conditions when assessing endpoints with one-time or limited-use business logic, such as coupon redemptions, payment fulfillment, referral flows, privilege assignments, and deletion windows where near-simultaneous requests might slip through read-then-write gaps.

The best way to exploit race conditions is by using HTTP/2 single-packet techniques to execute parallel requests with precise release timing, bypassing server-side locks to trigger multiple state changes before the application fully applies the initial update.

Verify race condition exploitability by applying a reproducibility gate that requires multiple attempts, measuring the actual state changes, and comparing response anomalies to confirm the vulnerability yields a duplicated effect consistently.

Yes, you can find double spending bugs in bug bounty programs by targeting payment, checkout, or transfer flows with parallel request strategies to exploit non-atomic business logic and trigger duplicate financial credits or entitlements.

Parallel requests cause double charges when applications fail to apply atomic transactions, allowing concurrent requests to pass initial balance or limit checks before the server registers the first state update, resulting in duplicated effects.