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Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M

CVE-2026-112947Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`

Medium 6.3

In plain English

A medium-severity path traversal in vite from vitejs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium
Exploit odds (30 days)0.5%top 56.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Ubuntu:22.04:LTSviteno fix listedUBUNTU-CVE-2026-112947
Ubuntu:24.04:LTSviteno fix listedUBUNTU-CVE-2026-112947
Ubuntu:26.04:LTSviteno fix listedUBUNTU-CVE-2026-112947
Ubuntu:26.10viteno fix listedUBUNTU-CVE-2026-112947
npmvite8.2.4GHSA-vfpm-58rq-9qcg
npmvite8.3.3GHSA-vfpm-58rq-9qcg
npmvite-plus1.1.0GHSA-vfpm-58rq-9qcg

Affected products (as reported)

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

Weakness: CWE-22, CWE-200, CWE-209 · Vector: 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

References