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CVE-2025-71401— better-auth before 1.4.2 basePath Modification DoS

Quick assessment

Affected
better-auth better-auth
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

better-auth是better-auth团队开源的一个身份验证框架。 better-auth 1.4.2之前版本存在资源管理错误漏洞，该漏洞源于外部请求可配置baseURL（当未定义时），攻击者可在服务器启动后发起首个请求，污染路由器的基础路径，导致所有路由返回404，造成拒绝服务。

CVSS 5.9 · Medium EPSS 0.46% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
better-auth better-auth < 1.4.2 affected
1.4.2 unaffected
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I. Basic Information for CVE-2025-71401

Vulnerability Information
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Vulnerability Title
better-auth before 1.4.2 basePath Modification DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
better-auth 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
better-auth是better-auth团队开源的一个身份验证框架。 better-auth 1.4.2之前版本存在资源管理错误漏洞，该漏洞源于外部请求可配置baseURL（当未定义时），攻击者可在服务器启动后发起首个请求，污染路由器的基础路径，导致所有路由返回404，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth better-auth 0 ~ 1.4.2 -

II. Public POCs for CVE-2025-71401

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III. Intelligence Information for CVE-2025-71401

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Vendor Advisories for CVE-2025-71401 (2)

Same Patch Batch · better-auth · 2026-08-02 · 3 CVEs total

CVE-2025-71399 8.6 HIGH Better Auth before 1.4.5 Path Normalization Bypass via rou3
CVE-2025-71400 7.1 HIGH better-auth passkey before 1.4.0 IDOR via delete-passkey

IV. Related Vulnerabilities

Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-770

V. Comments for CVE-2025-71401

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