CVE-2026-110861
Received
Received - Intake
Race Condition in Better Auth PostgreSQL Rate Limiting
Vulnerability report for CVE-2026-110861, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-14
Last updated on: 2026-10-14
Assigner: VulnCheck
Description
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.
CVSS Scores
EPSS Scores
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| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| better-auth | drizzle-adapter | 1.6.17 |
| better-auth | kysely-adapter | 1.6.17 |
| better-auth | better-auth | 1.6.17 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-307 | The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame. |
