@nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Re - @nuxt/webpack-builder

Description

This is an incomplete fix for GHSA-6m52-m754-pw2g. Source code may still 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): **>= 3.15.4, < 3.21.7

  >= 4.0.0, < 4.4.7**

• Patched version(s): **3.21.7

  4.4.7**

References

• GHSA-x6qj-4h56-5rj5
• CVE-2026-49993
• CWE-749
• CAPEC-310
• OWASP 2021-A6

Related Issues

• @nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Re - CVE-2026-49993
• Nuxt: Dev server exposes built source over LAN to malicious sites (incomplete fix for GHSA-4gf7-ff8x-hq99) - @nuxt/webpack-builder - 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
• RedwoodSDK has Same-site CSRF through lack of origin validation in its server actions - CVE-2026-42190

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Tags:

npm

@nuxt/webpack-builder