{"id":"EUVD-2026-34029","revision":"ff4e31cae9ec493fa3f94848300cd3d7","records":[{"revision":"ff4e31cae9ec493fa3f94848300cd3d7","observedAt":"2026-11-07T11:31:02.979+00:00","statement":{"source":"euvd","id":"EUVD-2026-34029","aliases":["CVE-2026-49143","GHSA-6vr3-7wcx-v5g5"],"title":"BrowserStack Runner through 0.9.5 contains a remote code execution vulnerability in the /_log HTTP handler that allows unauthenticated network-adjacent attackers to execute arbitrary code by submitting crafted JSON request bodies to the han…","description":"BrowserStack Runner through 0.9.5 contains a remote code execution vulnerability in the /_log HTTP handler that allows unauthenticated network-adjacent attackers to execute arbitrary code by submitting crafted JSON request bodies to the handler, which passes user-supplied data to vm.runInNewContext() combined with eval(). Attackers can escape the Node.js vm sandbox by leveraging a host-context Function reference through util.format to access the host process via this.constructor.constructor, achieving full remote code execution on the underlying system without any authentication.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.7,"severity":null}],"references":["https://github.com/browserstack/browserstack-runner/security/advisories/GHSA-6vr3-7wcx-v5g5","https://www.vulncheck.com/advisories/browserstack-runner-unauthenticated-rce-via-log-http-handler"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-34029","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 2, 2026, 8:31:16 PM","dateUpdated":"Oct 8, 2026, 3:23:02 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-34029","identifiers":["EUVD-2026-34029","CVE-2026-49143","GHSA-6vr3-7wcx-v5g5"]},"retained":false,"historicalAffected":[]}],"coverage":[]}