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CVE-2026-45364

CVE-2026-45364 · Better Auth: Rate limiter keys IPv6 addresses individually and is bypassable via prefix rotation

Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.

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 · Alta · EPSS 0,3% · Corrección disponible

Publicación
Actualización

Pila tecnológica: node

Productos y versiones afectados

  • better-auth

    Versiones
    • < 1.4.17: Afectada
    • >= 1.5.0-beta.1, < 1.5.0-beta.9: Afectada

    Sin corrección publicada

  • better-auth npm

    Intervalos de versiones afectados
    • SEMVER: < 1.4.17

    Actualiza a 1.4.17

  • better-auth npm

    Intervalos de versiones afectados
    • SEMVER: ≥ 1.5.0-beta.1, < 1.5.0-beta.9

    Actualiza a 1.5.0-beta.9

Fuentes originales

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