Description

Next.js is a React framework for building full-stack web applications. To mitigate CVE-2025-29927, Next.js validated the x-middleware-subrequest-id which persisted across multiple incoming requests. However, this subrequest ID is sent to all requests, even if the destination is not the same host as the Next.js application. Initiating a fetch request to a third-party within Middleware will send the x-middleware-subrequest-id to that third party. This vulnerability is fixed in 12.3.6, 13.5.10, 14.2.26, and 15.2.4.

INFO

Published Date :

2025-04-02T21:23:14.660Z

Last Modified :

2025-10-13T15:37:02.310Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2025-30218 vulnerability.

Vendors Products
Vercel
  • Next.js
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-30218.

URL Resource
https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-30218 cve-icon
https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-30218 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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SS Confidentiality
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Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact