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Medium severity6.1OSV Advisory· Published Jul 27, 2026· Updated Jul 29, 2026

CVE-2026-64645

CVE-2026-64645

Description

Next.js is a React framework for building full-stack web applications. In versions 12.0.0 through 15.5.20 and 16.0.0 through 16.2.10, a rewrites() or redirects() rule that builds its external destination hostname from request-controlled input can be pointed at an arbitrary hostname, regardless of the rule's hostname suffix. For a rewrite, Next.js proxies the request to that arbitrary host and serves the response from the application's origin, leading to Server-Side Request forgery. A redirects() rule configured this way is vulnerable to an Open Redirect. This issue has been fixed in versions 15.5.21 and 16.2.11.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
nextnpm
>= 12.0.0, < 15.5.2115.5.21
nextnpm
>= 16.0.0, < 16.2.1116.2.11

Affected products

17

Patches

Vulnerability mechanics

References

6

News mentions

4