Answer in brief
CVE-2026-84373 records a Medium severity (CVSS 5.9) vulnerability in Vitest: Path Traversal / Arbitrary File Read via @vitest/mocker Redirect Mock. The current sources do not mark it as known exploited. The current feed maps @vitest/mocker (generic), vitest-dev/vitest (generic), vitest (npm), vitest (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps @vitest/mocker (generic), vitest-dev/vitest (generic), vitest (npm), vitest (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| @vitest/mockergeneric | >= 2.1.0, < 4.1.11 || >= 5.0.0-beta.1, < 5.0.0-rc.2 | Not reported |
| vitest-dev/vitestgeneric | >= 2.1.0, < 4.1.11 || >= 5.0.0-beta.1, < 5.0.0-rc.2 | Not reported |
| vitestnpm | >=2.1.0,<4.1.11 | 4.1.11 |
| vitestnpm | >=5.0.0-beta.1,<5.0.0-rc.2 | 5.0.0-rc.2 |
| vitestnpm | >=2.1.0 <4.1.11 | 4.1.11 |
| vitestnpm | >=5.0.0-beta.1 <5.0.0-rc.2 | 5.0.0-rc.2 |
| @vitest/mockernpm | >=2.1.0,<4.1.11 | 4.1.11 |
| @vitest/mockernpm | >=5.0.0-beta.1,<5.0.0-rc.2 | 5.0.0-rc.2 |
| @vitest/mockernpm | >=2.1.0 <4.1.11 | 4.1.11 |
| @vitest/mockernpm | >=5.0.0-beta.1 <5.0.0-rc.2 | 5.0.0-rc.2 |
Published upstream
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 1, 2026
Vitest is a testing framework powered by Vite. From 2.1.0 until 4.1.11 and 5.0.0-rc.2, the public mockerPlugin and standalone interceptorPlugin exports in packages/mocker/src/node/interceptorPlugin.ts register the vitest:interceptor:register handler on Vite's unauthenticated HMR WebSocket without validating redirect targets against the file-serving allowlist. The implementation processes event.redirect without enforcing server.fs.allow and server.fs.deny through isFileLoadingAllowed. A remote client that can reach an exposed development server can submit an opaque URL scheme preserving .. segments, causing join(server.config.root, redirectUrl.pathname) to resolve outside the project root. The plugin's load hook then returns readFile(mock.redirect, 'utf-8') as module source, disclosing local files readable by the dev-server process. Vitest browser mode uses a token-authenticated RPC and is not remotely unauthenticated by default, although the same boundary check was missing on that path. This issue is fixed in versions 4.1.11 and 5.0.0-rc.2.
Quoted source text, attributed separately from HOL analysis.