GHSA-223J-4RM8-MRMF

Vulnerability from github – Published: 2025-04-02 22:35 – Updated: 2025-10-13 15:35
VLAI
Summary
Next.js may leak x-middleware-subrequest-id to external hosts
Details

Summary

In the process of remediating CVE-2025-29927, we looked at other possible exploits of Middleware. We independently verified this low severity vulnerability in parallel with two reports from independent researchers.

Learn more here.

Credit

Thank you to Jinseo Kim kjsman and RyotaK (GMO Flatt Security Inc.) with takumi-san.ai for the responsible disclosure. These researchers were awarded as part of our bug bounty program.

Severity
1.7 (Low)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "12.3.5"
            },
            {
              "fixed": "12.3.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "12.3.5"
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "13.5.9"
            },
            {
              "fixed": "13.5.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "13.5.9"
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "14.2.25"
            },
            {
              "fixed": "14.2.26"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "14.2.25"
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "next"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "15.2.3"
            },
            {
              "fixed": "15.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "15.2.3"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-30218"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-04-02T22:35:37Z",
    "nvd_published_at": "2025-04-02T22:15:19Z",
    "severity": "LOW"
  },
  "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\u00a0[RyotaK](https://hackerone.com/ryotak?type=user) (GMO Flatt Security Inc.) with [takumi-san.ai](https://takumi-san.ai)\u00a0for the responsible disclosure. These researchers were awarded as part of our bug bounty program.",
  "id": "GHSA-223j-4rm8-mrmf",
  "modified": "2025-10-13T15:35:50Z",
  "published": "2025-04-02T22:35:37Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Next.js may leak x-middleware-subrequest-id to external hosts"
}



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