Vulnerability in Better-Auth
CVE-2026-110861
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/better-auth/better-auth/security/advisories/GHSA-44jh-23m7-hpcf (vendor-advisory)
- www.vulncheck.com/advisories/better-auth-drizzle-adapter-1.6.17-before-1.7.7-ra… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110861?
- CVE-2026-110861 is a low-severity vulnerability in Better-Auth, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 3.7/10. Published 2026-10-14.
- How severe is CVE-2026-110861?
- Low severity. CVSS v3 base score is 3.7 out of 10.