{"cve":"CVE-2026-84373","nvd":{"published":"2026-09-01T22:17:19.143","modified":"2026-09-09T21:09:13.080","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-22"],"references":["https://github.com/vitest-dev/vitest/commit/51edf2b072902aec6d30c90ebaafd8f121c6f9d8","https://github.com/vitest-dev/vitest/commit/8ff9b9a9efca7c6cfd5243569440de8d7a33aec4","https://github.com/vitest-dev/vitest/commit/fe5a11d3ceac5ec10d6d7d21a46d4caca132c48f","https://github.com/vitest-dev/vitest/pull/10972","https://github.com/vitest-dev/vitest/pull/10974"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-84373","score":0.00527,"percentile":0.44677,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-82fw-gwwq-j7x9","url":"https://osv.dev/vulnerability/GHSA-82fw-gwwq-j7x9","summary":"Vitest: Path Traversal / Arbitrary File Read via @vitest/mocker Redirect Mock","modified":"2026-09-08T21:00:07.248611070Z","packages":[{"ecosystem":"npm","name":"@vitest/mocker","purl":"pkg:npm/%40vitest/mocker","ranges":[">=2.1.0 <4.1.11"],"fixed":["4.1.11"]},{"ecosystem":"npm","name":"vitest","purl":"pkg:npm/vitest","ranges":[">=2.1.0 <4.1.11"],"fixed":["4.1.11"]},{"ecosystem":"npm","name":"vitest","purl":"pkg:npm/vitest","ranges":[">=5.0.0-beta.1 <5.0.0-rc.2"],"fixed":["5.0.0-rc.2"]},{"ecosystem":"npm","name":"@vitest/mocker","purl":"pkg:npm/%40vitest/mocker","ranges":[">=5.0.0-beta.1 <5.0.0-rc.2"],"fixed":["5.0.0-rc.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}