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)
Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.
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 · Alta · EPSS 0,5% · Corrección disponible
- Publicación
- Actualización
Pila tecnológica: node
Productos y versiones afectados
express-rate-limit
- Versiones
- >= 8.0.0, < 8.0.2: Afectada
- >= 8.1.0, < 8.1.1: Afectada
- >= 8.2.0, < 8.2.2: Afectada
Sin corrección publicada
express-rate-limit npm
- Intervalos de versiones afectados
- SEMVER: ≥ 8.2.0, < 8.2.2
Actualiza a 8.2.2
express-rate-limit npm
- Versiones
- 8.1.0
- Intervalos de versiones afectados
- SEMVER: ≥ 8.1.0, < 8.1.1
Actualiza a 8.1.1
express-rate-limit npm
- Intervalos de versiones afectados
- SEMVER: ≥ 8.0.0, < 8.0.2
Actualiza a 8.0.2