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.
History

Tue, 20 Oct 2026 03:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 19 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Better-auth drizzle-adapter
Better-auth kysely-adapter
Vendors & Products Better-auth drizzle-adapter
Better-auth kysely-adapter

Wed, 14 Oct 2026 23:00:00 +0000

Type Values Removed Values Added
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.
Title Better Auth drizzle-adapter 1.6.17 before 1.7.7 Rate Limit Bypass via Race Condition
First Time appeared Better-auth
Better-auth better Auth
Weaknesses CWE-307
CPEs cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:*:*:*
Vendors & Products Better-auth
Better-auth better Auth
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.3, '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-14T22:52:45.713Z

Updated: 2026-10-20T02:26:30.363Z

Reserved: 2026-10-14T22:18:33.239Z

Link: CVE-2026-110861

cve-icon Vulnrichment

Updated: 2026-10-20T02:26:26.497Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-14T23:17:27.490

Modified: 2026-10-20T03:17:14.297

Link: CVE-2026-110861

cve-icon Redhat

No data.