CVE-2026-49993 PUBLISHED

@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)

Assigner: GitHub_M
Reserved: 02.06.2026 Published: 12.06.2026 Updated: 12.06.2026

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.

Metrics

CVSS Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.9

Product Status

Vendor nuxt
Product nuxt
Versions
  • Version >= 3.15.4, < 3.21.7 is affected
  • Version >= 4.0.0, < 4.4.7 is affected

References

Problem Types

  • CWE-749: Exposed Dangerous Method or Function CWE