CVE-2026-30827
CVE-2026-30827 · express-rate-limit: IPv4-mapped IPv6 addresses bypass per-client rate limiting (all IPv4 clients share one bucket on dual-stack servers)
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express-rate-limit is a basic rate-limiting middleware for Express. In versions starting from 8.0.0 and prior to versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0, the default keyGenerator in express-rate-limit applies IPv6 subnet masking (/56 by default) to all addresses that net.isIPv6() returns true for. This includes IPv4-mapped IPv6 addresses (::ffff:x.x.x.x), which Node.js returns as request.ip on dual-stack servers. Because the first 80 bits of all IPv4-mapped addresses are zero, a /56 (or any /32 to /80) subnet mask produces the same network key (::/56) for every IPv4 client. This collapses all IPv4 traffic into a single rate-limit bucket: one client exhausting the limit causes HTTP 429 for all other IPv4 clients. This issue has been patched in versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0.
CVSS 7.5 · Élevée · EPSS 0,5% · Correctif disponible
- Publication
- Mise à jour
Pile logicielle: node
Produits et versions concernés
express-rate-limit
- Versions du logiciel
- >= 8.0.0, < 8.0.2: Concernée
- >= 8.1.0, < 8.1.1: Concernée
- >= 8.2.0, < 8.2.2: Concernée
Aucun correctif publié
express-rate-limit npm
- Plages de versions concernées
- SEMVER: ≥ 8.2.0, < 8.2.2
Mettez à jour vers 8.2.2
express-rate-limit npm
- Versions du logiciel
- 8.1.0
- Plages de versions concernées
- SEMVER: ≥ 8.1.0, < 8.1.1
Mettez à jour vers 8.1.1
express-rate-limit npm
- Plages de versions concernées
- SEMVER: ≥ 8.0.0, < 8.0.2
Mettez à jour vers 8.0.2