Nuxt: Dev server exposes built source over LAN to malicious sites (incomplete fix for GHSA-4gf7-ff8x-hq99) - @nuxt/webpack-builder

Description

This is an incomplete fix for GHSA-4gf7-ff8x-hq99. Source code may be stolen during dev when using the webpack / rspack builder if the dev server is bound to a non-loopback address (e.g. nuxt dev --host) and the developer opens a malicious site on the same network.

Recommendation

Update the @nuxt/webpack-builder package to the latest compatible version. Followings are version details:

• Affected version(s): **>= 4.0.0-alpha.1, <= 4.4.5

  >= 3.15.4, <= 3.21.5**

• Patched version(s): **4.4.6

  3.21.6**

References

• GHSA-6m52-m754-pw2g
• CVE-2026-45670
• CWE-749
• CAPEC-310
• OWASP 2021-A6

Related Issues

• Nuxt: Dev server exposes built source over LAN to malicious sites (incomplete fix for GHSA-4gf7-ff8x-hq99) - CVE-2026-45670
• Opening a malicious website while running a Nuxt dev server could allow read-only access to code - @nuxt/webpack-builder - CVE-2025-24361
• webpack-dev-server users' source code may be stolen when they access a malicious web site - CVE-2025-30359
• Opening a malicious website while running a Nuxt dev server could allow read-only access to code - @nuxt/vite-builder - CVE-2025-24360

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Tags:

npm

@nuxt/webpack-builder