{"schema_version":"1.9.0","id":"GHSA-39w2-rjm5-chcv","published":"2026-10-07T20:31:51Z","modified":"2026-10-07T20:45:05.342044468Z","aliases":["CVE-2026-94486"],"summary":"Next.js has information disclosure in development server's Model Context Protocol endpoint","details":"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.","affected":[{"package":{"name":"next","ecosystem":"npm","purl":"pkg:npm/next"},"ranges":[{"type":"SEMVER","events":[{"introduced":"16.0.0"},{"fixed":"16.3.8"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-39w2-rjm5-chcv/GHSA-39w2-rjm5-chcv.json"}}],"references":[{"type":"WEB","url":"https://github.com/vercel/next.js/security/advisories/GHSA-39w2-rjm5-chcv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-94486"},{"type":"WEB","url":"https://github.com/vercel/next.js/commit/2d9f50a409312696145b82b3157aadb6b1fef476"},{"type":"PACKAGE","url":"https://github.com/vercel/next.js"},{"type":"WEB","url":"https://github.com/vercel/next.js/releases/tag/v16.3.8"}],"database_specific":{"cwe_ids":["CWE-346"],"github_reviewed":true,"github_reviewed_at":"2026-10-07T20:31:51Z","nvd_published_at":"2026-10-02T16:16:51Z","severity":"LOW"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"}]}