CVE-2026-46342
Nuxt: `__nuxt_island` endpoint does not bind responses to request props, enabling shared-cache poisoning
Impact
Nuxt is an open-source web development framework for Vue.js. In Nuxt versions 3.1.0 to before 3.21.6 and 4.0.0-alpha.1 to before 4.4.6 and @nuxt/nitro-server versions 3.20.0 to before 3.21.6 and 4.0.0-alpha.1 to before 4.4.6, the /__nuxt_island/* endpoint accepts attacker-controlled props query/body parameters and renders any island component without verifying that the URL-resident hash (<Name>_<hashId>.json) was actually issued for those inputs by <NuxtIsland>. The hash is computed and embedded client-side but never validated server-side, so the same path can return materially different responses depending on the query. This issue has been patched in versions 3.21.6 and 4.4.6.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | nuxt | >= 3.1.0, <= 3.21.5 | 3.21.6 |
| npm | @nuxt/nitro-server | >= 3.20.0, <= 3.21.5 | 3.21.6 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Nuxt | Nuxt | from 3.1.0 before 3.21.6 from 4.0.0 before 4.4.5 |
| Nuxt | Nuxt\/Nitro-Server | from 3.20.0 before 3.21.6 from 4.2.0 before 4.4.6 |