VulnerabilityAnalyzed

CVE-2025-30218

This vulnerability is fixed in 12.3.6, 13.5.10, 14.2.26, and 15.2.4.

LOW 1.7EPSS 0.42%

Does this matter?

Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 1.7 LOWCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.42% probability · 35th percentile
CISA KEV: Not listed
Weakness: CWE-200
Affected: vercel/next.js
Source: security-advisories@github.com

References

https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmfVendor Advisory
https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3OVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.