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CVE-2026-49143— BrowserStack Runner 0.9.5 Unauthenticated RCE via /_log HTTP Handler

CVSS 8.8 · High
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I. Basic Information for CVE-2026-49143

Vulnerability Information
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Vulnerability Title
BrowserStack Runner 0.9.5 Unauthenticated RCE via /_log HTTP Handler
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
browserstackbrowserstack-runner 0 ~ 0.9.5 -

II. Public POCs for CVE-2026-49143

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8248 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-49143

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Vendor Advisories for CVE-2026-49143 (2)

IV. Related Vulnerabilities

Same product: browserstack-runner
Same vendor: browserstack
Same weakness: CWE-94

V. Comments for CVE-2026-49143

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