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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)

🗓️ 07 Mar 2026 05:19:08Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 48 Views

Express-rate-limit throttles IPv4 clients together due to IPv6 masking on dual-stack servers.

Related
Affected
Refs
[
  {
    "vendor": "express-rate-limit",
    "product": "express-rate-limit",
    "versions": [
      {
        "version": ">= 8.0.0, < 8.0.2",
        "status": "affected"
      },
      {
        "version": ">= 8.1.0, < 8.1.1",
        "status": "affected"
      },
      {
        "version": ">= 8.2.0, < 8.2.2",
        "status": "affected"
      }
    ]
  }
]

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07 Mar 2026 05:19Current
CVSS 3.17.5
EPSS0.00535
SSVC
48