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CVE-2026-71321

7.5 · HIGH

Nuxt is an open-source web development framework for Vue.js.

Published Aug 5, 2026CWE-407EPSS 0.74%

Overview

CVE-2026-71321 is a high-severity vulnerability. It was published on August 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Nuxt is an open-source web development framework for Vue.js. From 3.1.0 until 3.21.10 and 4.5.1, the internal island renderer endpoint `/__nuxt_island/...` decodes and hashes attacker-controlled JSON body input with destr and ohash before validating the URL-resident hash. An unauthenticated `POST /__nuxt_island/_.json` with a large JSON body is fully read, parsed, hashed, and then rejected, which wastes CPU on Nitro single event loop and delays concurrent requests. No valid hash and no authentication are required. This issue is fixed in 3.21.10 and 4.5.1.

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/nuxt/nuxt/commit/4e35ae9babd94be53246e31200232d48438bb34eGitHubgithub.com/nuxt/nuxt/commit/668cdfdfda41849ed11c1ee5e2067a11fc103b22GitHubgithub.com/nuxt/nuxt/releases/tag/v3.21.10GitHubgithub.com/nuxt/nuxt/releases/tag/v4.5.1GitHubgithub.com/nuxt/nuxt/security/advisories/GHSA-9pgf-384g-p7mv

How CyberStrike helps

Frequently asked questions

What is CVE-2026-71321?

CVE-2026-71321 is a high-severity vulnerability. It was published on August 5, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-71321?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-71321?

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-2026-71321?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-71321 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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