{"id":"CVE-2026-49143","revision":"4214dc7889674b6cad2a0c4ed4ba659c","records":[{"revision":"4214dc7889674b6cad2a0c4ed4ba659c","observedAt":"2026-11-08T16:11:25.944+00:00","statement":{"source":"cve-program","id":"CVE-2026-49143","aliases":[],"title":"BrowserStack Runner 0.9.5 Unauthenticated RCE via /_log HTTP Handler","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":"2026-06-02T20:31:16.903+00:00","modifiedAt":"2026-11-08T14:04:50.871+00:00","affected":[{"ecosystem":"Vendor product","name":"browserstack-runner","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"affected\",\n                    \"packageURL\": \"pkg:npm/browserstack-runner\",\n                    \"vendor\": \"browserstack\",\n                    \"product\": \"browserstack-runner\",\n                    \"repo\": \"https://github.com/browserstack/browserstack-runner\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"semver\",\n                            \"lessThanOrEqual\": \"0.9.5\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"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":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"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://www.cve.org/CVERecord?id=CVE-2026-49143","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-49143","identifiers":["CVE-2026-49143"]},"retained":false,"historicalAffected":[]}],"coverage":[]}