{"id":"CVE-2026-49143","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 …","summary":"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 …","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-94"],"vendor":"browserstack","product":"browserstack-runner","affected":["browserstack-runner <= 0.9.5"],"published":"2026-06-02","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:18.667","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-49143","references":[{"url":"https://github.com/browserstack/browserstack-runner/security/advisories/GHSA-6vr3-7wcx-v5g5","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/browserstack-runner-unauthenticated-rce-via-log-http-handler","label":"disclosure@vulncheck.com"},{"url":"https://github.com/browserstack/browserstack-runner/security/advisories/GHSA-6vr3-7wcx-v5g5","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-06-03T14:02:08.658694Z"},"epss":0.00671,"epssPercentile":0.50492,"ingestedAt":"2026-10-08T16:52:14.685Z","slug":"CVE-2026-49143","body":"## Overview\n\nBrowserStack 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":61,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}