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CVE-2026-47209— vm2: Bridge Proxy set trap ignores receiver parameter, enabling host object property injection via prototype chain

Quick assessment

Affected
patriksimek vm2
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

patriksimek vm2是patriksimek的沙箱。 Patrik Simek vm2 3.11.4之前版本存在处理逻辑错误漏洞，该漏洞源于BaseHandler.set trap忽略receiver参数并无条件写入主机目标对象，可能导致攻击者通过继承属性写入将危险的跨域Symbol键写入主机对象。

CVSS 8.6 · High EPSS 0.29% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
patriksimek vm2 < 3.11.4 affected
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I. Basic Information for CVE-2026-47209

Vulnerability Information
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Vulnerability Title
vm2: Bridge Proxy set trap ignores receiver parameter, enabling host object property injection via prototype chain
Source: CVE Program / CVE List V5
Vulnerability Description
vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, the BaseHandler.set trap in bridge.js (line 1231) ignores the receiver parameter and unconditionally writes to the host target object. Per the Proxy set trap specification, when receiver !== proxy (e.g., when a child object inherits from the proxy via Object.create), the property assignment should create an own property on the receiver, not on the proxy target. The current implementation always calls otherReflectSet(object, key, value) against the host target, causing all inherited property writes to leak through to the host object. This bug provides an alternative attack vector for writing dangerous cross-realm Symbol keys (e.g., nodejs.util.promisify.custom) to host objects, bypassing any future per-trap isDangerousCrossRealmSymbol guard on the direct set path. This issue has been patched in version 3.11.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
保护机制失效
Source: CVE Program / CVE List V5
Vulnerability Title
Patrik Simek vm2 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
patriksimek vm2是patriksimek的沙箱。 Patrik Simek vm2 3.11.4之前版本存在处理逻辑错误漏洞，该漏洞源于BaseHandler.set trap忽略receiver参数并无条件写入主机目标对象，可能导致攻击者通过继承属性写入将危险的跨域Symbol键写入主机对象。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
patriksimek vm2 < 3.11.4 -

II. Public POCs for CVE-2026-47209

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: prototype chain injection leaked proof token PROOF_36a9444f32e11971
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 9845 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-47209

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Patches & Fixes for CVE-2026-47209 (1)

Vendor Advisories for CVE-2026-47209 (1)

Vendor Pages for CVE-2026-47209 (1)

Same Patch Batch · patriksimek · 2026-06-12 · 9 CVEs total

CVE-2026-47140 10.0 CRITICAL vm2: NodeVM builtin denylist bypass via process and inspector/promises allows host code ex
CVE-2026-47208 10.0 CRITICAL vm2: Sandbox Breakout Using Promise Species
CVE-2026-47137 10.0 CRITICAL vm2: GHSA-8hg8-63c5-gwmx patch bypass: nesting:true without explicit require still allows
CVE-2026-47131 10.0 CRITICAL vm2: Sandbox Escape
CVE-2026-47210 9.8 CRITICAL vm2 sandbox escape via JSPI-backed Promise `.finally()` species bypass
CVE-2026-47135 8.7 HIGH vm2: Sandbox escape via unblocked cross-realm Symbol.for keys + missing bridge write-trap
CVE-2026-47139 8.6 HIGH vm2: NodeVM network builtin exclusions bypass via internal _http_client and _http_server
CVE-2026-47141 vm2: NodeVM observability builtins leak host process and HTTP request data

IV. Related Vulnerabilities

Same product: vm2
Same vendor: patriksimek
Same weakness: CWE-693

V. Comments for CVE-2026-47209

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