Next.js has information disclosure in App Router metadata image routes via dynamicParams bypass

MEDIUM 5.3CVE-2026-94485 · GHSA-f87g-xv8r-7p7x · Published 02/10/2026 · updated 05/10/2026

Package	Affected versions	Patched versions
next.js vercel	`≥ 16.0.0, < 16.3.8`	`16.3.8`
next npm	`≥ 16.0.0, < 16.3.8`	`16.3.8`

Description

In Next.js App Router applications built with webpack, metadata image routes such as opengraph-image and twitter-image ignore the dynamicParams route segment option. An attacker can request metadata image URLs for dynamic segments that were deliberately excluded from generateStaticParams().

NVD 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.

References

vercel/next.js security advisory · WEB
nvd.nist.gov/vuln/detail/CVE-2026-94485 · ADVISORY
vercel/next.js commit 2d9f50a · WEB
vercel/next.js · PACKAGE
vercel/next.js release v16.3.8 · WEB

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