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CVE-2026-64645

6.1 · MEDIUM

Next.js is a React framework for building full-stack web applications.

Published Jul 27, 2026CWE-601EPSS 0.41%

Overview

CVE-2026-64645 is a medium-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/vercel/next.js/commit/35f501357e9b0fe7c950b0d6aa8fcf5343f707e9GitHubgithub.com/vercel/next.js/commit/d3033266c6dff23f7be71e19341fe3a8c6e2c599GitHubgithub.com/vercel/next.js/releases/tag/v15.5.21GitHubgithub.com/vercel/next.js/releases/tag/v16.2.11GitHubgithub.com/vercel/next.js/security/advisories/GHSA-p9j2-gv94-2wf4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64645?

CVE-2026-64645 is a medium-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-64645?

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64645?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64645?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64645 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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