GHSA-3xf4-9g3c-4h4w: @nuxt/vite-builder (CVE-2026-119201)

Package	Ecosystem	Affected	Fixed in
@nuxt/vite-builder	npm	>=4.6.0, <4.6.3	4.6.3

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The @nuxt/vite-builder package, versions 4.6.0 before 4.6.3, let the Nuxt dev server serve a generated development secret file (app-secret in the build directory) through Vite's file serving when no appSecret is configured. An attacker with direct HTTP access to a dev server exposed to a network can read the file and derive secrets from it, including the default useSession password, and forge session cookies accepted by that server. Upgrade @nuxt/vite-builder to 4.6.3, which denies access to the file; setting NUXT_APP_SECRET to a random value of at least 32 characters is an alternative.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.8	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0021, the 10th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 13:32 UTC First seen by agentprime
31 Oct 2026, 13:32 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.