Nuxt dev server exposes private runtime config through the Nitro dev bundle (CVE-2026-119199)

What is affected, what to do

Update @nuxt/vite-builder to version 4.6.3.

Affected

• Nuxt gte 3.0.0, < 4.6.3..*

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Metrics

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2

NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

Read in glossary

Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.

CRA

The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

Read in glossary

From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.

ISO/IEC 27001

ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

Read in glossary

Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

curl http://<dev-server>/_nuxt/@fs/<absolute-path-to-project>/.nuxt/dev/index.mjs

export default defineNuxtConfig({
  runtimeConfig: {
    apiSecret: process.env.API_SECRET,
  },
})

Source: OSV (Open Source Vulnerabilities), GitHub Security Advisories, NVD (NIST), cvelistv5

Vendors and products

• Nuxt Nuxt

Weakness classes (CWE)

• CWE-200Exposure of Sensitive Information to an Unauthorized Actor

  Class

  The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

  Entry at MITRE CWE-200

• CWE-538Insertion of Sensitive Information into Externally-Accessible File or Directory

  Base

  The product places sensitive information into files or directories that are accessible to actors who are allowed to have access to the files, but not to the sensitive information.

  Entry at MITRE CWE-538

• CWE-552Files or Directories Accessible to External Parties

  Base

  The product makes files or directories accessible to unauthorized actors, even though they should not be.

  Entry at MITRE CWE-552

References & sources

• github.comnuxt/nuxt/commit/12b58f9d8768682611c3ad4ea4d403875129dbcax_refsource_MISC, web
• github.comnuxt/nuxt/releases/tag/v4.6.3x_refsource_MISC, web
• github.comnuxt/nuxt/security/advisories/GHSA-648h-gw55-m2g7x_refsource_CONFIRM, web
• NVD (NIST)vuln/detail/CVE-2026-119199advisory
• github.comnuxt/nuxtpackage

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

1. 29.10.2026ReceivedGitHub

   CVSS V3.1: AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

   Weakness type: CWE-200, CWE-538

   Description added or changed

   New references:

   • https://github.com/nuxt/nuxt/commit/12b58f9d8768682611c3ad4ea4d403875129dbca
   • https://github.com/nuxt/nuxt/releases/tag/v4.6.3
   • https://github.com/nuxt/nuxt/security/advisories/GHSA-648h-gw55-m2g7
   Show 8 original changes

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Description	added	—	Nuxt is an open-source web development framework for Vue.js. From 3.0.0 until 4.6.3, the Nuxt development server can expose the Nitro 2 development bundle at <buildDir>/dev/index.mjs through Vite file serving when the server is reachable over HTTP. Nitro inlines private runtimeConfig values resolved at build time into that bundle, including secrets configured in nuxt.config, and Nuxt 4.6.0 and later also inline the generated development appSecret. The default localhost binding limits remote exposure, production builds and Nitro 3 are not affected, and runtime configuration supplied only through NUXT_* environment variables at server startup is not inlined. This issue is fixed in version 4.6.3.
   CVSS	added	—	AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
   Weakness type (CWE)	added	—	CWE-200
   Weakness type (CWE)	added	—	CWE-538
   Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/119xxx/CVE-2026-119199.json">CVE-2026-119199</a>
   Reference	added	—	https://github.com/nuxt/nuxt/commit/12b58f9d8768682611c3ad4ea4d403875129dbca
   Reference	added	—	https://github.com/nuxt/nuxt/releases/tag/v4.6.3
   Reference	added	—	https://github.com/nuxt/nuxt/security/advisories/GHSA-648h-gw55-m2g7

   Source identifier: security-advisories@github.com

2. 29.10.2026Record modifiedCISA ADP

   CISA assessment (SSVC): exploitation: none known, automatable: no

   Show the original change

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   SSVC assessment	added	—	{"id":"CVE-2026-119199","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-29T20:27:35.512756Z"}

   Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0