GHSA-4342-x723-ch2f

Next.js Improper Middleware Redirect Handling Leads to SSRF

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-57822

Packages

Ecosystem	Package	Affected	Fixed in
npm	next	>= 0.9.9, < 14.2.32	14.2.32
npm	next	>= 15.0.0-canary.0, < 15.4.7	15.4.7

Details

As written in the advisory (Markdown source, shown as plain text).

A vulnerability in **Next.js Middleware** has been fixed in **v14.2.32** and **v15.4.7**. The issue occurred when request headers were directly passed into `NextResponse.next()`. In self-hosted applications, this could allow Server-Side Request Forgery (SSRF) if certain sensitive headers from the incoming request were reflected back into the response. All users implementing custom middleware logic in self-hosted environments are strongly encouraged to upgrade and verify correct usage of the `next()` function. More details at [Vercel Changelog](https://vercel.com/changelog/cve-2025-57822)

References

External links from the advisory. They lead to third-party sites.