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Fencer Intel
low 3.1

CVE-2026-128072 json

@nuxt/webpack-builder and @nuxt/rspack-builder dev server serves built source to DNS rebinding pages

published 12d ago modified yesterday also EUVD-2026-125624 , GHSA-x2wv-5868-p7v2

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository nuxt/nuxt. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
3.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

Nuxt is an open-source web development framework for Vue.js. From @nuxt/webpack-builder 3.0.0 and @nuxt/rspack-builder 3.12.2 until 4.6.4, the development middleware trusts Origin, Referer, or Sec-Fetch-Site when the Host header names the same attacker-controlled hostname. After DNS rebinding changes that hostname to a loopback address, a malicious page opened by a developer can read /_nuxt/*.js client chunks and inline source maps, exposing compiled application source, local filesystem paths, and developer-controlled values embedded in the client bundle. The attacker must know or guess the development-server port and induce the developer to open the malicious page; Chrome 142 and later and other Chromium-based browsers that enforce Local Network Access restrictions prompt before a public page can reach the loopback address. The default Vite builder and production builds are unaffected. This issue is fixed in version 4.6.4.

Patch / fix

  • npm @nuxt/webpack-builder 4.6.4
  • npm @nuxt/rspack-builder 4.6.4

Is CVE-2026-128072 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-14).

CVSS scores

assigned by version score vector
CNA 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm @nuxt/webpack-builder
>=4.0.0, <4.6.4
>=3.0.0, <4.0.0
4.6.4
npm @nuxt/rspack-builder
>=4.0.0, <4.6.4
>=3.12.2, <4.0.0
4.6.4

Affected products

  • nuxt nuxt
  • @nuxt webpack-builder
  • @nuxt rspack-builder

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of nuxt/nuxt published their own advisory on GitHub. Reviewed sources take precedence over it.