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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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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