CVE-2026-112362

{
  "etk_id": "ETK-2026-2755",
  "cve_id": "CVE-2026-112362",
  "display_id": "CVE-2026-112362",
  "ghsa_id": "GHSA-6h42-57hq-9746",
  "euvd_id": "EUVD-2026-110753",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Path normalization authentication bypass in @fastify/express",
  "summary": "@fastify/express versions 4.0.5 through 4.0.8 can skip path-scoped Express middleware because Fastify and the plugin resolve certain request paths differently. An unauthenticated remote attacker may bypass authentication, authorization, or rate-limiting middleware when the non-default ignoreDuplicateSlashes option is enabled.",
  "mitigation": "Upgrade @fastify/express to version 4.0.9 or later. Until upgraded, leave ignoreDuplicateSlashes disabled or enforce access controls in a Fastify preHandler hook.",
  "vendor": "@fastify/express",
  "product": "@fastify/express",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 4.0.5, < 4.0.9"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "4.0.9"
      ],
      "package_name": "@fastify/express",
      "purl": "pkg:npm/@fastify/express"
    }
  ],
  "cwes": [
    436
  ],
  "cvss_score": 9.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 17.192355533333334,
  "t0_at": "2026-10-27T11:27:59.364000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-27T11:27:59.364000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-27T11:27:59.364000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-112362"
    }
  }
}