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Advisories

Better Auth drizzle-adapter 1.6.17 before 1.7.7 Rate Limit Bypass via Race Condition

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Severity
medium
Date
Affecting

  • drizzle-adapter >= 1.6.17, < 1.7.7

  • kysely-adapter >= 1.6.17, < 1.7.0

  • better-auth >= 1.6.17, < 1.7.7

CWE
  • CWE-307 Improper Restriction of Excessive Authentication Attempts
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
designorant
Description
Better Auth @better-auth/drizzle-adapter and better-auth from 1.6.17 before 1.7.7, and @better-auth/kysely-adapter from 1.6.17 before 1.7.0, contain a race condition in database-backed rate limiting on PostgreSQL where the limit check is not atomic with the counter update. Remote attackers can send bursts of concurrent requests that pass the check together, exceeding configured limits on password sign-in, two-factor verification, one-time code, password reset, and other rate-limited endpoints.

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