CVE-2025-30218

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.

Reserved 2025-03-18 | Published 2025-04-02 | Updated 2025-04-03 | Assigner GitHub_M

Problem types

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Product status

= 12.3.5
affected

= 13.5.9
affected

= 14.2.25
affected

= 15.2.3
affected

References

github.com/...ext.js/security/advisories/GHSA-223j-4rm8-mrmf

vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O

cve.org (CVE-2025-30218)

nvd.nist.gov (CVE-2025-30218)

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