Next.jsに脆弱性（CVE-2026-94486）
概要
Next.jsに脆弱性が確認されました。
バージョン 16.0.0 以上 16.3.8 未満に影響があります。
修正版 16.3.8 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-94486 GHSA-39w2-rjm5-chcv |
|---|---|
| 脆弱性の種類 | CWE-346 |
| 危険度 | 中 |
| CVSSスコア |
5.4（CVSS v3.x） CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N |
| 公開日 | 2026年10月7日 |
影響を受ける製品
| 製品 | 影響を受けるバージョン | 修正版 | 出典 |
|---|---|---|---|
| Next.js |
16.0.0 以上 16.3.8 未満 | 16.3.8 | OSV.dev |
推奨対応
- Next.jsを修正版 16.3.8 またはそれ以降の公式最新版へ更新してください。
情報元の原文
OSV.dev
Next.js has information disclosure in development server's Model Context Protocol endpoint
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.
利用条件：CC BY 4.0
出典: GitHub Advisory Database（OSV.dev 経由で取得）。原文のまま掲載（改変なし）
NVD（National Vulnerability Database / NIST）
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.
利用条件：米国政府の著作物（パブリックドメイン）・原文のまま掲載
Copyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
CVE List（CVE Program）
Next.js: Information disclosure in the Next.js development server's Model Context Protocol endpoint
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.
利用条件：CVE の利用条件（CVE Terms of Use）・原文のまま掲載
Copyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
情報元
- OSV.dev
https://github.com/advisories/GHSA-39w2-rjm5-chcv - NVD（National Vulnerability Database / NIST）
https://nvd.nist.gov/vuln/detail/CVE-2026-94486 - CVE List（CVE Program）
https://www.cve.org/CVERecord?id=CVE-2026-94486