CVE-2026-49143
- Source
- https://cve.org/CVERecord?id=CVE-2026-49143
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-49143.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-49143
- Aliases
- Published
- 2026-06-02T20:31:16.903Z
- Modified
- 2026-06-18T03:57:18.141349255Z
- Severity
-
- 8.7 (High) CVSS_V4 - 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 CVSS Calculator
- Summary
- BrowserStack Runner 0.9.5 Unauthenticated RCE via /_log HTTP Handler
- Details
-
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.
- Database specific
{ "cna_assigner": "VulnCheck", "cwe_ids": [ "CWE-94" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49143.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49143.json
- https://github.com/browserstack/browserstack-runner/security/advisories/GHSA-6vr3-7wcx-v5g5
- https://nvd.nist.gov/vuln/detail/CVE-2026-49143
- https://www.vulncheck.com/advisories/browserstack-runner-unauthenticated-rce-via-log-http-handler
- https://github.com/browserstack/browserstack-runner
Affected packages
Git / github.com/browserstack/browserstack-runner
Affected ranges
- Type
- GIT
- Repo
- https://github.com/browserstack/browserstack-runner
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "source": [ "AFFECTED_FIELD", "DESCRIPTION" ], "extracted_events": [ { "introduced": "0" }, { "last_affected": "0.9.5" }, { "introduced": "0" }, { "fixed": "0.9.5" } ] }