CVE-2025-30218
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Vercel Next.js
PublishedApr 2, 2025
First seenApr 2, 2025
Weakness typeCWE-200Sensitive information exposure
How to fix
Update
- next12.3.6, 13.5.10, 14.2.26, 15.2.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vercel next.js | 12.3.5, 13.5.9, 14.2.25, 15.2.3 | — |
| nextnpm | 12.3.5 ≤ v < 12.3.6, 13.5.9 ≤ v < 13.5.10, 14.2.25 ≤ v < 14.2.26, 15.2.3 ≤ v < 15.2.4 | 12.3.6, 13.5.10, 14.2.26, 15.2.4 |
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