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CVE-2026-64647

5.4 · MEDIUM

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

Published Jul 27, 2026CWE-116EPSS 0.32%

Overview

CVE-2026-64647 is a medium-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, 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 server-side fetch with a request body may return a cached response body from a different request to the same URL but different body. Confidential data in the POST's response body would then leak to unauthorized requests. Though the request itself will not be deduped. This is only an issue when receiving request bodies with a content type charset other than UTF-8. For example, the UTF-16 byte sequences for 삃삃 and 섄섄 in the request body would share the same cache. 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/025bf4a5f7b47fb7758c4ebf1c931a61c451c082GitHubgithub.com/vercel/next.js/pull/96008GitHubgithub.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-4633-3j49-mh5q

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64647?

CVE-2026-64647 is a medium-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-64647?

This vulnerability has a CVSS 3.1 base score of 5.4, 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-2026-64647?

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-2026-64647?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64647 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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