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 · Hoch · EPSS 0,5% · Korrektur verfügbar
- Veröffentlicht
- Aktualisiert
Technologie-Stack: node
Betroffene Produkte und Versionen
express-rate-limit
- Softwareversionen
- >= 8.0.0, < 8.0.2: Betroffen
- >= 8.1.0, < 8.1.1: Betroffen
- >= 8.2.0, < 8.2.2: Betroffen
Keine Korrektur veröffentlicht
express-rate-limit npm
- Betroffene Versionsbereiche
- SEMVER: ≥ 8.2.0, < 8.2.2
Auf 8.2.2 aktualisieren
express-rate-limit npm
- Softwareversionen
- 8.1.0
- Betroffene Versionsbereiche
- SEMVER: ≥ 8.1.0, < 8.1.1
Auf 8.1.1 aktualisieren
express-rate-limit npm
- Betroffene Versionsbereiche
- SEMVER: ≥ 8.0.0, < 8.0.2
Auf 8.0.2 aktualisieren