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.

CVSS 4.0

2.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

5.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS

0.1% chance of exploitation in the next 30 days; higher than 1% of CVEs (scores of 2026-10-25)

CWE

CWE-346

Published

2026-10-02

Modified

2026-10-05

Record from

the NVD, synced 2026-10-19

Affected

• vercel:next.js

Packages (OSV)

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

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