Nuxt up to 3.x/4.6.3 nitro-server escape output

Summaryinfo

A vulnerability was found in Nuxt up to 3.x/4.6.3. It has been declared as problematic. This issue affects some unknown processing of the component nitro-server. Executing a manipulation can lead to escape output. The identification of this vulnerability is CVE-2026-128076. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Nuxt up to 3.x/4.6.3. It has been declared as problematic. This vulnerability affects some unknown processing of the component nitro-server. The manipulation with an unknown input leads to a escape output vulnerability. The CWE definition for the vulnerability is CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. As an impact it is known to affect integrity. CVE summarizes:

Nuxt is an open-source web development framework for Vue.js. From 3.21.6 to before 4.0.0 and from 4.4.6 until 4.6.4, the /__nuxt_island path hash uses ohash serialization that does not escape quotes in string values or delimiters in object keys, allowing different island-prop tuples to produce the same path. For prerendering, substituted content is written into the generated page only if the crawler reaches a colliding URL before rendering the page with the legitimate props. Separately, a CDN or reverse proxy that keys island responses by path alone can be primed with the colliding response. If the substituted prop reaches v-html, innerHTML, or another unsafe HTML sink, the response can execute script in the application origin; otherwise the impact is content substitution. Applications that do not use server components or NuxtIsland, islands without attacker-influenced string props, and responses not cached by path alone are unaffected. This issue is fixed in version 4.6.4.

The advisory is available at github.com. This vulnerability was named CVE-2026-128076 since 11/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 4.6.4 eliminates this vulnerability.

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Productinfo

Name

• Nuxt

Version

• 3.x
• 4.6.0
• 4.6.1
• 4.6.2
• 4.6.3

Website

• Product: https://github.com/nuxt/nuxt/

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