CVE-2026-45364
CVE-2026-45364 · Better Auth: Rate limiter keys IPv6 addresses individually and is bypassable via prefix rotation
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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.
CVSS 7.3 · Высокий · EPSS 0,3% · Есть исправление
- Опубликовано
- Обновлено
Стек: node
Затронутые продукты и версии
better-auth
- Версии
- < 1.4.17: Затронуто
- >= 1.5.0-beta.1, < 1.5.0-beta.9: Затронуто
Нет опубликованного исправления
better-auth npm
- Затронутые диапазоны версий
- SEMVER: < 1.4.17
Обновитесь до 1.4.17
better-auth npm
- Затронутые диапазоны версий
- SEMVER: ≥ 1.5.0-beta.1, < 1.5.0-beta.9
Обновитесь до 1.5.0-beta.9
Первоисточники
- https://github.com/better-auth/better-auth/security/advisories/GHSA-p6v2-xcpg-h6xw
- https://github.com/better-auth/better-auth/pull/7470
- https://github.com/better-auth/better-auth/pull/7509
- https://github.com/better-auth/better-auth/commit/43e719bcc0c223c7079fa0c611a9cf7ea1188254
- https://github.com/better-auth/better-auth/commit/57af0f7b910dcf7b1a5c0615d10b9bd56bb69bef
- https://nvd.nist.gov/vuln/detail/CVE-2026-45364