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CVE-2026-45364

7.3 · HIGH

Better Auth is an authentication and authorization library for TypeScript.

Published May 28, 2026CWE-307EPSS 0.50%

Overview

CVE-2026-45364 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.4.17 and 1.5.0-beta.9, Better Auth's HTTP rate limiter keyed each request by the exact textual IP address it received in x-forwarded-for (or the configured IP-bearing header). IPv6 clients controlling a typical /64 allocation could rotate through 2^64 distinct source addresses without exhausting the per-address counter, defeating rate limiting on /sign-in/email, /sign-up/email, /forget-password, and every other path the limiter protects. The same bug allowed a single client to vary the textual encoding of one IPv6 address (uppercase, compression, IPv4-mapped, hex-encoded IPv4-in-IPv6) and produce multiple distinct keys. This vulnerability is fixed in 1.4.17 and 1.5.0-beta.9.

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/43e719bcc0c223c7079fa0c611a9cf7ea1188254GitHubgithub.com/better-auth/better-auth/commit/57af0f7b910dcf7b1a5c0615d10b9bd56bb69befGitHubgithub.com/better-auth/better-auth/pull/7470GitHubgithub.com/better-auth/better-auth/pull/7509GitHubgithub.com/better-auth/better-auth/security/advisories/GHSA-p6v2-xcpg-h6xw

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45364?

CVE-2026-45364 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-45364?

This vulnerability has a CVSS 3.1 base score of 7.3, 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-2026-45364?

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-2026-45364?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45364 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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