CVE-2026-49993mediumCWE-749

CVE-2026-49993: medium-severity vulnerability in nuxt

@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

Follow this CVE+ Monitor nuxt+ Monitor @nuxt/rspack-builder

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.9epss 0.3%
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.
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
Affected products
nuxt · nuxt
Related CVEs — nuxt

In the same product, most dangerous first.

CVE-2024-23657HIGHPath Traversal: '../filedir' in Nuxt DevtoolsEPSS 1.2%CVE-2026-71314HIGHNuxt: Unauthenticated out-of-memory crash via unbounded v-for expansion in island renderingEPSS 0.9%CVE-2024-34344HIGHRemote code execution via the browser when running the test locally in nuxtEPSS 0.8%CVE-2026-71321HIGHNuxt: Unauthenticated CPU exhaustion parsing and hashing the Nuxt island endpoint body before hash validationEPSS 0.7%CVE-2026-71320HIGHNuxt: Server-Side Remote Code Execution via Runtime Template Injection in Nuxt Server Island PropsEPSS 0.7%CVE-2025-24360MEDIUMOpening a malicious website while running a Nuxt dev server could allow read-only access to codeEPSS 0.6%