Nuxt: Route rules are matched against the raw request path, so a percent-encoded segment can bypass `appMiddleware` on dynamic and…

Summary

Nuxt is an open-source web development framework for Vue.js. From 3.11.0 until 3.21.4 and 4.4.4, Nuxt compares route-rule keys with the raw request path while route resolution decodes dynamic and catch-all parameters, allowing a percent-encoded segment to resolve to a protected page without matching the routeRules entry intended for that path. As a result, appMiddleware can be skipped during server rendering and an unauthenticated requester can receive the gated page and its SSR data. The same mismatch affects app-manifest rules including redirect, appLayout, ssr, prerender, and payload flags derived from cache, isr, and swr. This vulnerability is fixed in 4.4.4 and 3.21.4.

Timeline

1. Oct 21, 2026, 5:41 PM UTCCVE published
2. Oct 22, 2026, 7:20 PM UTCFirst seen by cve.now
3. Oct 30, 2026, 5:48 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

4. Oct 30, 2026, 5:48 PM UTCRecord last updated

Affected versions

• nuxt nuxt

  From 4.0.0 · fixed in 4.4.4; From 3.11.0 · fixed in 3.21.4

• nuxtnpm

  From 4.0.0 · fixed in 4.4.4

• nuxtnpm

  From 3.11.0 · fixed in 3.21.4

References 5