CVE-2026-47429
Description
A flaw was found in Vitest, a testing framework. On Windows, the Vitest UI/API server incorrectly handled file serving, which could allow an attacker to read sensitive files outside the project directory. Additionally, exposed API features could be exploited to execute arbitrary scripts, leading to potential system compromise.
Statement
Vitest ships a UI and API server (enabled via the --ui or --api flags, or automatically as part of Browser Mode) that exposes file read, file write, and test-rerun functionality over HTTP. Due to an incorrect path-traversal check in the /vitest_attachment handler and related code paths, a remote attacker who can reach this server can read arbitrary files, and via the write/rerun features can achieve arbitrary code execution. Exploitation requires either exposing the server to a network host (--api.host / api.host config) or running the UI/Browser Mode on Windows.
Red Hat's shipped products use vitest exclusively as a development-time unit test runner (invoked as vitest run, test:unit, or --project in CI/build pipelines). None of the Red Hat products that ship vitest start its UI server, API server, or Browser Mode as part of their build process or shipped runtime. The @vitest/browser package (required for Browser Mode) is not present in any Red Hat product's manifest. As a result, the vulnerable code path is not reachable in any Red Hat product covered by this flaw, and affects are set to NOTAFFECTED / Vulnerable Code not in Execute Path.
Mitigation
No mitigation is required for Red Hat products, as none run Vitest's UI/API server or Browser Mode in their build or shipped runtime.
Developers who run `vitest --ui`, `vitest --api`, or Browser Mode interactively should avoid binding the server to a non-localhost host, and should upgrade to vitest >= 4.1.0 (or >= 3.2.5 on the 3.x branch), where the allowWrite/allowExec flags default to disabled whenever the server is bound to a non-localhost host.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.1 | 5.9 | 9.8 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | High | Low |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | High | High | High |
| Integrity Impact | High | None | High |
| Availability Impact | High | None | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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