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OpenAdvisories
Medium · 5.9 CVE-2026-49993 EUVD-2026-36421GHSA-x6qj-4h56-5rj5

@nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Referer are all absent (incomplete fix for GHSA-6m52-m754-pw2g)

Published Jun 12, 2026 · Updated Jun 12, 2026 · Assigned by GitHub_M

Description

Nuxt is an open-source web development framework for Vue.js. In @nuxt/rspack-builder and @nuxt/webpack-builder from versions 3.15.4 to before 3.21.7 and 4.0.0 to before 4.4.7, there 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. This issue has been patched in versions 3.21.7 and 4.4.7.

Affected products

VendorProductAffectedFixed
nuxt nuxt >= 3.15.4, < 3.21.7, >= 4.0.0, < 4.4.7 —

Affected packages

EcosystemPackageAffectedFixedRecord
npm @nuxt/rspack-builder >= 4.0.0, < 4.4.7 4.4.7 GHSA-x6qj-4h56-5rj5
npm @nuxt/rspack-builder >= 3.15.4, < 3.21.7 3.21.7 GHSA-x6qj-4h56-5rj5
npm @nuxt/webpack-builder >= 4.0.0, < 4.4.7 4.4.7 GHSA-x6qj-4h56-5rj5
npm @nuxt/webpack-builder >= 3.15.4, < 3.21.7 3.21.7 GHSA-x6qj-4h56-5rj5

References