Medium severity5.9NVD Advisory· Published Apr 2, 2025· Updated Jun 17, 2026
CVE-2025-30218
CVE-2025-30218
Description
Next.js is a React framework for building full-stack web applications. To mitigate CVE-2025-29927, Next.js validated the x-middleware-subrequest-id which persisted across multiple incoming requests. However, this subrequest ID is sent to all requests, even if the destination is not the same host as the Next.js application. Initiating a fetch request to a third-party within Middleware will send the x-middleware-subrequest-id to that third party. This vulnerability is fixed in 12.3.6, 13.5.10, 14.2.26, and 15.2.4.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
nextnpm | >= 12.3.5, < 12.3.6 | 12.3.6 |
nextnpm | >= 13.5.9, < 13.5.10 | 13.5.10 |
nextnpm | >= 14.2.25, < 14.2.26 | 14.2.26 |
nextnpm | >= 15.2.3, < 15.2.4 | 15.2.4 |
Affected products
6cpe:2.3:a:vercel:next.js:12.3.5:*:*:*:*:node.js:*:*+ 4 more
- cpe:2.3:a:vercel:next.js:12.3.5:*:*:*:*:node.js:*:*
- cpe:2.3:a:vercel:next.js:13.5.9:*:*:*:*:node.js:*:*
- cpe:2.3:a:vercel:next.js:14.2.25:*:*:*:*:node.js:*:*
- cpe:2.3:a:vercel:next.js:15.2.3:*:*:*:*:node.js:*:*
- (no CPE)range: = 12.3.5
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-223j-4rm8-mrmfghsaADVISORY
- github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmfnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2025-30218ghsaADVISORY
- vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3OnvdVendor AdvisoryWEB
News mentions
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