Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`
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.
CVE-2026-112947
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-112947
vite
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
vite-plus
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "vitejs",
"product": "vite",
"versions": [
{
"status": "affected",
"version": ">= 8.3.0, < 8.3.3"
},
{
"status": "affected",
"version": ">= 8.2.0, < 8.2.4"
}
]
},
{
"vendor": "vitejs",
"product": "vite-plus",
"versions": [
{
"status": "affected",
"version": ">= 0.2.8, < 1.1.0"
}
]
}
]- Related CVEs
- CVE-2026-112947
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #49201 · Revision 1
- Added to Heist Feed
- Publisher date