{
  "schema_version": "1.4.0",
  "id": "GHSA-4q56-crqp-v477",
  "modified": "2025-04-01T22:23:33Z",
  "published": "2025-04-01T22:23:33Z",
  "aliases": [
    "CVE-2025-31137"
  ],
  "summary": "Remix and React Router allow URL manipulation via Host / X-Forwarded-Host headers",
  "details": "### Impact\n\nWe received a report about a vulnerability in Remix/React Router that affects all Remix 2 and React Router 7 consumers using the Express adapter. Basically, this vulnerability allows anyone to spoof the URL used in an incoming `Request` by putting a URL pathname in the port section of a URL that is part of a `Host` or `X-Forwarded-Host` header sent to a Remix/React Router request handler.\n\n### Patches\n\nThis issue has been patched and released in Remix 2.16.3 React Router 7.4.1.\n\n### Credits\n\n- Rachid Allam (zhero;)\n- Yasser Allam (inzo_)",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@react-router/express"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.4.1"
            }
          ]
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "@remix-run/express"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "2.11.1"
            },
            {
              "fixed": "2.16.3"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/remix-run/react-router/security/advisories/GHSA-4q56-crqp-v477"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-31137"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/remix-run/react-router"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2025-04-01T22:23:33Z",
    "nvd_published_at": "2025-04-01T19:15:45Z"
  }
}