All vulnerabilities
CVE-2026-94486GHSA-39w2-rjm5-chcv

Next.js has information disclosure in development server's Model Context Protocol endpoint

vercel nextnpmFrameworks
Open in ThreatlineRecord JSON
CVSS
2.3Low
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.11%Chance of exploitation activity in the next 30 days, higher than 1% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in16.3.8Also 16.3.?GitHub
Published2 Oct 2026Updated 7 Oct 2026CVE List

What fixes it

  • 16.3.8next, npmGitHubnpm install next@16.3.8
  • 16.3.?next, npmGitHubnpm install next@16.3.?

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

The Next.js development server (next dev) exposes a Model Context Protocol endpoint that does not verify which website a request originates from, allowing a malicious website visited by the developer to read sensitive development data — including the project's location on disk, source code snippets from error reports, the route inventory, and development logs. Only applications run with next dev are affected. Production deployments do not serve this endpoint.

Text from CVE List

Affected versions 4

  • next, npm>= 16.0.0, < 16.3.8GitHub
  • next.jsaffected: >= 16.0.0, < 16.3.8CVE List
  • next, npm>= 16.0.0GitHub
  • next, npmfrom 16.0.0, fixed in 16.3.8OSV

References 5