CVE-2026-47209
published 2026-06-12CVE-2026-47209: 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…
PriorityP348high8.6CVSS 3.1
AVNACLPRNUINSCCNIHAN
EPSS
0.29%
20.4th percentile
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.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| ansible-automation-platform | automation-portal | — | — |
| patriksimek | vm2 | < 3.11.4 | 3.11.4 |
| rhdh | rhdh-hub-rhel9 | — | — |
| vm2_project | vm2 | >= 0 < 3.11.4 | 3.11.4 |
CVSS provenance
nvdv3.18.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
vendor_redhat8.6HIGH
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Red Hat
vm2: vm2: Integrity bypass via incorrect property assignment leading to potential arbitrary code execution
vendor_redhat·2026-06-12·CVSS 8.6
CVE-2026-47209 [HIGH] CWE-915 vm2: vm2: Integrity bypass via incorrect property assignment leading to potential arbitrary code execution
vm2: vm2: Integrity bypass via incorrect property assignment leading to potential arbitrary code execution
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 S
GHSA
vm2's Bridge Proxy set trap ignores receiver parameter, enabling host object property injection via prototype chain
ghsa·2026-05-29
CVE-2026-47209 [HIGH] CWE-693 vm2's Bridge Proxy set trap ignores receiver parameter, enabling host object property injection via prototype chain
vm2's Bridge Proxy set trap ignores receiver parameter, enabling host object property injection via prototype chain
## Summary
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.
No detection rules found.
No public exploits indexed.
2026-06-12
Published