AIKIDO-2026-261025
@better-auth/drizzle-adapter is vulnerable to Race Condition (TOCTOU)
37
Low Risk
This Affects:
@better-auth/drizzle-adapterTL;DR
When rate limits are stored in PostgreSQL, the current count is checked and the incremented value is written in separate steps, so concurrent requests can each read the limit before any of them writes its update. A burst of simultaneous requests against password sign-in, two factor verification, one time codes, or password resets can exceed the configured maximum attempts. The fix includes the guard predicate in the same database operation that writes the new count.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you store rate limit records in a PostgreSQL database through the Drizzle adapter with rate limiting enabled.
Background info
@better-auth/drizzle-adapter is vulnerable to Race Condition (TOCTOU) in versions 1.6.17 - 1.7.6.
How to fix this
Upgrade the @better-auth/drizzle-adapter and/or the better-auth library to the patch version.
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