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CVE-2026-110861— Better Auth drizzle-adapter 1.6.17 before 1.7.7 Rate Limit Bypass via Race Condition

Quick assessment

Affected
better-auth drizzle-adapter
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Better Auth 的 @better-auth/drizzle-adapter（版本 1.6.17 至 1.7.7 之间）以及 better-auth（版本 1.6.17 至 1.7.7 之间），还有 @better-auth/kysely-adapter（版本 1.6.17 至 1.7.0 之间），在基于 PostgreSQL 数据库的速率限制机制中存在竞态条件漏洞。该问题表现为速率限制的“检查”操作与“计数器更新”操作并非原子执行。 远程攻击者可以通过并发发送大量请求，使这些请求同时通过速率限制检查，从而

CVSS 3.7 · Low EPSS 0.22% · P11

Possible ATT&CK Techniques 1 AI

T1110.003 · Password Spraying

Affected Version Matrix 6

VendorProduct Version RangeStatus
better-auth better-auth 1.6.17< 1.7.7 affected
1.7.7 unaffected
better-auth drizzle-adapter 1.6.17< 1.7.7 affected
1.7.7 unaffected
better-auth kysely-adapter 1.6.17< 1.7.0 affected
1.7.0 unaffected
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I. Basic Information for CVE-2026-110861

Vulnerability Information
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Vulnerability Title
Better Auth drizzle-adapter 1.6.17 before 1.7.7 Rate Limit Bypass via Race Condition
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth drizzle-adapter 1.6.17 ~ 1.7.7 -
better-auth kysely-adapter 1.6.17 ~ 1.7.0 -
better-auth better-auth 1.6.17 ~ 1.7.7 -

II. Public POCs for CVE-2026-110861

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III. Intelligence Information for CVE-2026-110861

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Other References for CVE-2026-110861 (2)

Same Patch Batch · better-auth · 2026-10-14 · 4 CVEs total

CVE-2026-110862 9.1 CRITICAL Better Auth 1.4.0-beta.18 before 1.7.7 Authentication Bypass via Magic Link
CVE-2026-110863 8.1 HIGH Better Auth @better-auth/sso before 1.7.3 Authentication Bypass via Personal SSO Providers
CVE-2026-110864 7.4 HIGH Better Auth 1.5.0-beta.12 before 1.7.7 Authentication Bypass via OAuth Proxy

IV. Related Vulnerabilities

Same vendor: better-auth
Same weakness: CWE-307

V. Comments for CVE-2026-110861

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