CVE-2026-49143
CVE-2026-49143 · BrowserStack Runner 0.9.5 Unauthenticated RCE via /_log HTTP Handler
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.7 · High · EPSS 0.8%
- Published
- Updated
Stack: node
Affected products and versions
browserstack-runner
- Versions
- ≥ 0, ≤ 0.9.5: Affected (semver)
No fix published
browserstack-runner npm
- Affected ranges
- SEMVER: ≤ 0.9.5
No fix published