{
  "schema_version": "1.4.0",
  "id": "GHSA-223j-4rm8-mrmf",
  "modified": "2025-04-03T13:24:25Z",
  "published": "2025-04-02T22:35:37Z",
  "aliases": [
    "CVE-2025-30218"
  ],
  "summary": "Next.js may leak x-middleware-subrequest-id to external hosts",
  "details": "## Summary\nIn the process of remediating [CVE-2025-29927](https://github.com/advisories/GHSA-f82v-jwr5-mffw), we looked at other possible exploits of Middleware. We independently verified this low severity vulnerability in parallel with two reports from independent researchers.\n\nLearn more [here](https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O).\n\n## Credit\n\nThank you to Jinseo Kim [kjsman](https://hackerone.com/kjsman?type=user) and [RyotaK](https://hackerone.com/ryotak?type=user) (GMO Flatt Security Inc.) with [takumi-san.ai](https://takumi-san.ai) for the responsible disclosure. These researchers were awarded as part of our bug bounty program.",
  "severity": [
    {
      "type": "CVSS_V4",
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "12.3.5"
            },
            {
              "fixed": "12.3.6"
            }
          ]
        }
      ],
      "versions": [
        "12.3.5"
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "13.5.9"
            },
            {
              "fixed": "13.5.10"
            }
          ]
        }
      ],
      "versions": [
        "13.5.9"
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "14.2.25"
            },
            {
              "fixed": "14.2.26"
            }
          ]
        }
      ],
      "versions": [
        "14.2.25"
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "15.2.3"
            },
            {
              "fixed": "15.2.4"
            }
          ]
        }
      ],
      "versions": [
        "15.2.3"
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-30218"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vercel/next.js"
    },
    {
      "type": "WEB",
      "url": "https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "severity": "LOW",
    "github_reviewed": true,
    "github_reviewed_at": "2025-04-02T22:35:37Z",
    "nvd_published_at": "2025-04-02T22:15:19Z"
  }
}