Vulnerability · Published Oct 29, 2026 · Assigned by GitHub_M

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

Medium 5.9

In plain English

A medium-severity information exposure in nuxt from nuxt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.4%top 71.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@nuxt/vite-builder	4.6.3	GHSA-648h-gw55-m2g7

Affected products (as reported)

Vendor	Product	Versions
nuxt	nuxt	>= 3.0.0, < 4.6.3

Weakness: CWE-200, CWE-538 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

References

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