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.
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Better-auth |
|
No data.
No data.
No data.
References
History
Sun, 02 Aug 2026 12:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | better-auth before 1.4.1 basePath Modification DoS | |
| First Time appeared |
Better-auth
Better-auth better-auth\/oauth-provider |
|
| Weaknesses | CWE-770 | |
| CPEs | cpe:2.3:a:better-auth:better-auth\/oauth-provider:*:*:*:*:*:node.js:*:* | |
| Vendors & Products |
Better-auth
Better-auth better-auth\/oauth-provider |
|
| References |
| |
| Metrics |
cvssV3_1
|
MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-08-02T12:19:23.688Z
Reserved: 2026-07-18T12:38:41.077Z
Link: CVE-2025-71401
Vulnrichment
No data.
NVD
No data.
Redhat
No data.
OpenCVE Enrichment
No data.