---
id: CVE-2026-112947
title: >-
  Vite: First 4 bytes of files outside of `server.fs` setting is exposed by
  `?vite-wasm-instance`
summary: >-
  Vite is a frontend tooling framework for JavaScript. From 8.2.0 until 8.2.4
  and 8.3.3, the first 4 bytes of files outside of server.fs setting can be
  returned to the browser by a request containing ?vite-wasm-instance. Requests
  containin…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-22
  - CWE-200
  - CWE-209
vendor: vitejs
product: vite
affected:
  - 'vite >= 8.3.0, < 8.3.3'
  - 'vite >= 8.2.0, < 8.2.4'
  - 'vite-plus >= 0.2.8, < 1.1.0'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T15:10:51.025Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112947'
references:
  - url: 'https://github.com/vitejs/vite/security/advisories/GHSA-vfpm-58rq-9qcg'
    label: 'https://github.com/vitejs/vite/security/advisories/GHSA-vfpm-58rq-9qcg'
  - url: 'https://github.com/vitejs/vite/pull/23655'
    label: 'https://github.com/vitejs/vite/pull/23655'
  - url: >-
      https://github.com/vitejs/vite/commit/b6c6d2fb3f853aab4092dc25f0d6816a96c23dff
    label: >-
      https://github.com/vitejs/vite/commit/b6c6d2fb3f853aab4092dc25f0d6816a96c23dff
  - url: >-
      https://github.com/vitejs/vite/commit/ba8b7ab43b4afa5d0292ab4b6e3a7b5033cc9c73
    label: >-
      https://github.com/vitejs/vite/commit/ba8b7ab43b4afa5d0292ab4b6e3a7b5033cc9c73
tags:
  - cve.org
ingestedAt: '2026-10-20T16:10:53.330Z'
---

## Overview

Vite is a frontend tooling framework for JavaScript. From 8.2.0 until 8.2.4 and 8.3.3, the first 4 bytes of files outside of server.fs setting can be returned to the browser by a request containing ?vite-wasm-instance. Requests containing the ?vite-wasm-instance query are handled by the internal Wasm plugin's load hook. The hook removes the query and reads the resulting path directly from disk, but the server.fs checks were not applied. After reading the file, Vite attempts to parse it as WebAssembly. When that parse fails, Node and deno throws an error that contains the first 4 bytes of the file. This vulnerability is fixed in 8.2.4 and 8.3.3.

## Affected

- `vite >= 8.3.0, < 8.3.3`
- `vite >= 8.2.0, < 8.2.4`
- `vite-plus >= 0.2.8, < 1.1.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.