CVE-2026-45670: Nuxt Nuxt/rspack-Builder

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Nuxt is an open-source web development framework for Vue.js. In @nuxt/rspack-builder and @nuxt/webpack-builder versions 3.15.4 to before 3.21.6, and 4.0.0-alpha.1 to before 4.4.6, there 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. This issue has been patched in versions 3.21.6 and 4.4.6.

Affected products

• Nuxt Nuxt/rspack-Builder: from 3.12.2, before 3.21.5 (fixed in 3.21.5); from 4.0.0, before 4.4.5 (fixed in 4.4.5)
• Nuxt Nuxt/webpack-Builder: from 3.0.0, before 3.21.5 (fixed in 3.21.5); from 4.0.0, before 4.4.5 (fixed in 4.4.5)

Published 2026-06-12. Last modified 2026-06-17.