CVE-2025-71401
CVE-2025-71401 · better-auth before 1.4.2 basePath Modification DoS
This page contains facts from public vulnerability sources. Check the original advisory before updating.
better-auth (npm) before 1.4.2 allows an external request to configure baseURL when it is not otherwise defined (e.g., BETTER_AUTH_URL is unset). An attacker able to make the very first request to the server after startup can poison the router's base path, causing all routes to return 404 for all users (denial of service). The issue is not reachable when baseURL is explicitly configured or on typical managed hosting platforms.
CVSS 9.3 · Critical · EPSS 0.5% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
better-auth
- Versions
- ≥ 0, < 1.4.2: Affected (semver)
- 1.4.2: Not affected (semver)
Update to 1.4.2
better-auth npm
- Affected ranges
- SEMVER: < 1.4.2
Update to 1.4.2