CVE-2026-71320: Nuxt RCE via Runtime Template Injection in Server Island Props

CVE-2026-71320 · Severity: high · CVSS 8.1 · Published 2026-08-05

Nuxt is a popular web framework for building Vue.js applications. A vulnerability in its 'server islands' feature allows attackers to execute malicious code on the server if specific configuration settings are enabled. This could lead to a full system compromise, unauthorized data access, or service disruption.

Technologies: nuxt (npm). Vendors: npm.

Quick answers

Is CVE-2026-71320 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-71320 being exploited in the wild.
How severe is CVE-2026-71320?
High severity, with a CVSS score of 8.1, published 5 August 2026.
Which products and versions are affected?
nuxt (npm) SEMVER:introduced=4.0.0,fixed=4.5.1.
Is there a fix for CVE-2026-71320?
Yes. nuxt (npm): upgrade to 4.5.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-71320 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-71320?
Check whether you run nuxt (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • nuxt (npm): upgrade to 4.5.1 or later
    npm install nuxt@4.5.1

Technical details

A remote code execution (RCE) vulnerability exists in Nuxt core when 'Server Islands' are used in conjunction with the Vue runtime compiler (vue.runtimeCompiler: true). Attackers can inject a 'template' key into island props via the /__nuxt_island/ endpoint. If these props are forwarded to dynamic component resolution functions like <component :is>, resolveDynamicComponent, or h(), the Vue runtime compiler will execute the attacker-controlled template in the server process. This can occur even without explicit prop forwarding due to Vue's attribute inheritance (fallthrough) if the island's root is a polymorphic component. The vulnerability is fixed in Nuxt versions 3.21.10 and 4.5.1.

Affected products

  • Nuxt Nuxt >= 3.4.0, < 3.21.10; >= 4.0.0, < 4.5.1

Identifiers

  • CVE-2026-71320
  • GHSA-9473-5f9j-94wq

Timeline

  • 2026-07-27: disclosed: Initial disclosure by developer
  • 2026-08-05: advisory: GitHub Advisory published
  • 2026-08-05: patched: Fixes released in 3.21.10 and 4.5.1

References

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