Riskcovery

CVE-2026-110861

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

State
Published
Severity
6.3 Medium
Published
Oct 14, 2026
Updated
Oct 20, 2026
Reserved
Oct 14, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
4.06.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:NVulnCheck
3.13.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:NVulnCheck

Weaknesses

  • CWE-307 Improper Restriction of Excessive Authentication Attempts

Affected Products

ProductVersions
drizzle-adapterbetter-auth
  • 1.6.17 to before 1.7.7Affected
  • 1.7.7Not affected
kysely-adapterbetter-auth
  • 1.6.17 to before 1.7.0Affected
  • 1.7.0Not affected
better-authbetter-auth
  • 1.6.17 to before 1.7.7Affected
  • 1.7.7Not affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.