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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 · Élevée · EPSS 0,3% · Correctif disponible

Publication
Mise à jour

Pile logicielle: node

Produits et versions concernés

  • better-auth

    Versions du logiciel
    • < 1.4.17: Concernée
    • >= 1.5.0-beta.1, < 1.5.0-beta.9: Concernée

    Aucun correctif publié

  • better-auth npm

    Plages de versions concernées
    • SEMVER: < 1.4.17

    Mettez à jour vers 1.4.17

  • better-auth npm

    Plages de versions concernées
    • SEMVER: ≥ 1.5.0-beta.1, < 1.5.0-beta.9

    Mettez à jour vers 1.5.0-beta.9

Sources originales

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