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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| vercel | next.js | = 12.3.5, = 13.5.9, = 14.2.25, = 15.2.3 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | next | >= 12.3.5, < 12.3.6 | 12.3.6 | GHSA-223j-4rm8-mrmf |
| npm | next | >= 13.5.9, < 13.5.10 | 13.5.10 | GHSA-223j-4rm8-mrmf |
| npm | next | >= 14.2.25, < 14.2.26 | 14.2.26 | GHSA-223j-4rm8-mrmf |
| npm | next | >= 15.2.3, < 15.2.4 | 15.2.4 | GHSA-223j-4rm8-mrmf |