medium5.4
CVE-2026-94486
Next.js has information disclosure in development server's Model Context Protocol endpoint
Impact
Next.js is a React framework for building full-stack web applications. From 16.0.0 until 16.3.8, the next dev development server exposes a Model Context Protocol endpoint without reliably restricting cross-site requests. A malicious website visited by a developer can reach the endpoint and read the project's disk location, source code snippets from error reports, route inventory, and development logs. Production deployments do not serve this endpoint. This issue is fixed in version 16.3.8.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | next | >= 16.0.0, < 16.3.8 | 16.3.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Vercel | Next.Js | from 16.0.0 before 16.3.8 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-39w2-rjm5-chcv
- https://github.com/vercel/next.js/security/advisories/GHSA-39w2-rjm5-chcv
- https://nvd.nist.gov/vuln/detail/CVE-2026-94486
- https://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476
- https://github.com/vercel/next.js/releases/tag/v16.3.8