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CVE-2025-71399

8.6 · HIGH

Better Auth relies on better-call, which uses the rou3 router library.

Published Aug 2, 2026CWE-20EPSS 0.52%

Overview

CVE-2025-71399 is a high-severity vulnerability. It was published on August 2, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Better Auth relies on better-call, which uses the rou3 router library. In affected versions of rou3, paths are normalized by removing empty segments, so /path, //path, and ///path resolve to the same route. In Better Auth versions prior to 1.4.5 (which bundles the fixed rou3), this can allow attackers to bypass disabledPaths configuration and path-based rate limits by submitting requests with extra slashes in the URL path. The issue does not apply in deployments where the proxy or platform normalizes URLs by collapsing multiple slashes.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/better-auth/better-auth/commit/f60b43fa648399534507c9ac7db36d705b8874c3GitHubgithub.com/better-auth/better-auth/security/advisories/GHSA-x732-6j76-qmhmRefwww.vulncheck.com/advisories/better-auth-before-path-normalization-bypass-via-rou3

How CyberStrike helps

Frequently asked questions

What is CVE-2025-71399?

CVE-2025-71399 is a high-severity vulnerability. It was published on August 2, 2026 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2025-71399?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-71399?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-71399?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-71399 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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