Files or Directories Accessible to External Parties Affecting @vitest/browser package, versions >=5.0.0-beta.6 <5.0.5
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-VITESTBROWSER-21347790
- published21 Oct 2026
- disclosed20 Oct 2026
- creditThai Son Dinh, tikket1, Tomohiro Yamada
Introduced: 20 Oct 2026
NewCVE-2026-112948 (opens in a new tab)How to fix?
Upgrade @vitest/browser to version 5.0.5 or higher.
Overview
@vitest/browser is a Browser running for Vitest
Affected versions of this package are vulnerable to Files or Directories Accessible to External Parties via the Vite dev server's server.fs.deny configuration, which drops its built-in defaults (blocking .env, certificates, .npmrc, etc.) whenever any value is appended to the deny list. When @vitest/ui (or Browser Mode or the api option) starts an HTTP server, the previous fix appended the API token file to server.fs.deny after Vite had already compiled the matcher, causing Vite to discard its default protections. An unauthenticated remote attacker can then request sensitive files - such as .env files or private key material - through the Vite dev server.
Note: This is only exploitable when Vitest runs an HTTP server, which occurs with the UI (--ui), Browser Mode, or api enabled.