CVE-2026-71314: Nuxt denial of service via unbounded v-for expansion in island rendering

CVE-2026-71314 · Severity: high · CVSS 7.5 · Published 2026-08-05

Nuxt, a popular framework for building web applications, is vulnerable to a denial-of-service attack. An unauthenticated attacker can send a specially crafted request that forces the server to allocate an excessive amount of memory, leading to a system crash. This can disrupt business operations by making the website or application unavailable to legitimate users.

Technologies: nuxt (npm). Vendors: npm.

Quick answers

Is CVE-2026-71314 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-71314 being exploited in the wild.
How severe is CVE-2026-71314?
High severity, with a CVSS score of 7.5, 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-2026-71314?
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-2026-71314 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-71314?
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

Nuxt is vulnerable to uncontrolled resource consumption (CWE-400) within its island rendering engine. The vulnerability exists because the island URL hash is a non-secret digest, allowing an attacker to compute valid hashes for arbitrary props. By sending a large integer as a prop to a component using 'v-for' (e.g., v-for='n in count'), the server attempts to expand the loop into millions of nodes during Server-Side Rendering (SSR). This results in excessive memory allocation and an out-of-memory (OOM) crash of the worker process. The issue affects both Vue's 'ssrRenderList' and the 'vforToArray' slot helper. Patches in versions 4.5.1 and 3.21.10 introduce a 'MAX_VFOR_LENGTH' clamp of 100,000 iterations to mitigate this amplification.

Affected products

  • Nuxt Nuxt >= 4.0.0, < 4.5.1; >= 3.1.0, < 3.21.10

Identifiers

  • CVE-2026-71314
  • GHSA-hxcr-hm88-mpq6

Timeline

  • 2026-07-27: disclosed
  • 2026-08-05: advisory
  • 2026-08-05: patched

References

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