Nuxt Client-Side Path Traversal in Nuxt Island Payload Revival

Summary

Nuxt is an open-source web development framework for Vue.js. Prior to 3.19.0 and 4.1.0, A client-side path traversal vulnerability in Nuxt's Island payload revival mechanism allowed attackers to manipulate client-side requests to different endpoints within the same application domain when specific prerendering conditions are met. The vulnerability occurs in the client-side payload revival process (revive-payload.client.ts) where Nuxt Islands are automatically fetched when encountering serialized __nuxt_island objects. During prerendering, if an API endpoint returns user-controlled data containing a crafted __nuxt_island object, he data gets serialized with devalue.stringify and stored in the prerendered page. When a client navigates to the prerendered page, devalue.parse deserializes the payload. The Island reviver attempts to fetch /__nuxt_island/${key}.json where key could contain path traversal sequences. Update to Nuxt 3.19.0+ or 4.1.0+.

Timeline

1. Sep 17, 2025, 6:39 PM UTCCVE published
2. Sep 17, 2025, 7:42 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Sep 17, 2025, 7:42 PM UTCRecord last updated

Affected versions

• nuxt nuxt

  >= 3.6.0 < 3.19.0, >= 4.0.0 < 4.1.0

• nuxtnpm

  From 3.6.0 · fixed in 3.19.0

• nuxtnpm

  From 4.0.0 · fixed in 4.1.0

References 2