CVE-2026-64645
Description
Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a rewrites() or redirects() rule that builds its external destination hostname from request-controlled input can be pointed at an arbitrary hostname, regardless of the rule's hostname suffix. For a rewrite, Next.js proxies the request to that arbitrary host and serves the response from the application's origin, leading to Server-Side Request forgery. A redirects() rule configured this way is vulnerable to an Open Redirect. This issue has been fixed in versions 15.5.21 and 16.2.11.
How to fix
- vercel next.js15.5.21, 16.2.11 or later
- next15.5.21, 16.2.11 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vercel next.js | 12.0.0 ≤ v < 15.5.21, 16.0.0 ≤ v < 16.2.11 | 15.5.21, 16.2.11 |
| nextnpm | 12.0.0 ≤ v < 15.5.21, 16.0.0 ≤ v < 16.2.11 | 15.5.21, 16.2.11 |
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Attack Surface Management
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