CVE-2026-94485Next.js: Information disclosure in Next.js App Router metadata image routes via dynamicParams bypass

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/vercel/next.js/security/advisories/GHSA-f87g-xv8r-7p7x Vendor Advisory
• https://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476 Patch
• https://github.com/vercel/next.js/releases/tag/v16.3.8 Release Notes