CVE-2026-110861
Published:October 14, 2026
Updated:October 16, 2026
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.
Affected Packages
better-auth (NPM):
Affected version(s) >=1.7.0 <1.7.7Fix Suggestion:
Update to version 1.7.7@better-auth/drizzle-adapter (NPM):
Affected version(s) >=1.7.0 <1.7.7Fix Suggestion:
Update to version 1.7.7@better-auth/kysely-adapter (NPM):
Affected version(s) >=1.6.17 <1.7.0Fix Suggestion:
Update to version 1.7.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Restriction of Excessive Authentication Attempts
EPSS
Base Score:
0.22