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CVE-2026-49143 is an unauthenticated remote code execution vulnerability affecting BrowserStack Runner through version 0.9.5. The flaw resides in the /_log HTTP handler, which accepts crafted JSON request bodies and passes attacker-controlled data into vm.runInNewContext() in combination with eval(). This unsafe evaluation path allows an attacker to inject JavaScript into the handler’s processing logic. The provided analysis indicates that exploitation targets the arguments array in the JSON body and abuses a host-context Function reference via util.format to escape the intended Node.js vm sandbox. By traversing the constructor chain, for example via this.constructor.constructor("return process")(), an attacker can recover the host Node.js process object and then invoke process.mainModule.require('child_process').execSync() or similar primitives to execute operating system commands on the underlying host.
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A remote code execution vulnerability in browserstack-runner that allows an attacker to inject JavaScript, access the Node.js process object, load child_process, and execute operating system commands.
A remote code execution vulnerability in BrowserStack Runner through 0.9.5 affecting the /_log HTTP handler, where crafted JSON input reaches vm.runInNewContext() and eval(), enabling Node.js vm sandbox escape and unauthenticated code execution.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.