CVE-2025-30218
Published: Apr 2, 2025
Modified: Oct 13, 2025
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.
| Vendor | Product | Versions |
|---|---|---|
vercel | next.js | affected = 12.3.5affected = 13.5.9affected = 14.2.25affected = 15.2.3 |
Weaknesses (CWE)
References
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