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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-28
• Weakness: CWE-79

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 .

Affected products

• nuxt: from 3.13.0, < 4.6.2

References

• https://github.com/nuxt/nuxt/commit/493565e99451a0f52330b1f6b979254a4a39e5d0
• https://github.com/nuxt/nuxt/releases/tag/v4.6.2
• https://github.com/nuxt/nuxt/security/advisories/GHSA-xfq5-w38q-pc2x

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