CRITICAL 9.3 NVD
CVE-2025-71401
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 ab
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.
References
- https://github.com/better-auth/better-auth/security/advisories/GHSA-569q-mpph-wgww
- https://www.vulncheck.com/advisories/better-auth-before-basepath-modification-dos
This critical severity vulnerability with a CVSS score of 9.3 was published on 2026-08-02 via NVD.
Risk Timeline
CVE Disclosed2026-08-02 · 1 day ago
Remediation Resources
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