Vulnerability · Published Oct 2, 2026 · Assigned by GitHub_M

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

Medium 6.3

In plain English

A medium-severity security flaw in next.js from vercel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.2%top 93.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	next	16.3.8	GHSA-f87g-xv8r-7p7x

Affected products (as reported)

Vendor	Product	Versions
vercel	next.js	>= 16.0.0, < 16.3.8

Weakness: CWE-346 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/vercel/next.js/security/advisories/GHSA-f87g-xv8r-7p7x x_refsource_CONFIRM
https://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476 x_refsource_MISC
https://github.com/vercel/next.js/releases/tag/v16.3.8 x_refsource_MISC