CVE-2026-94486

Description

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.

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Weakness Type (CWE)

CWE-346 CWE-346

References

Other References

https://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476 https://github.com/vercel/next.js/releases/tag/v16.3.8 https://github.com/vercel/next.js/security/advisories/GHSA-39w2-rjm5-chcv

Frequently Asked Questions

What is CVE-2026-94486? +

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.

How do I check if I'm vulnerable to CVE-2026-94486? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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