CVE-2026-47209

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Source
https://cve.org/CVERecord?id=CVE-2026-47209
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47209.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-47209
Aliases
Downstream
Published
2026-06-12T14:14:06.455Z
Modified
2026-07-08T08:13:35.871997552Z
Severity
  • 8.6 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N CVSS Calculator
Summary
vm2: Bridge Proxy set trap ignores receiver parameter, enabling host object property injection via prototype chain
Details

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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47209.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-693"
    ]
}
References

Affected packages

Git / github.com/patriksimek/vm2

Affected ranges

Type
GIT
Repo
https://github.com/patriksimek/vm2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
26d0318b5e6555be4b187ba05d6cf378ccecfe22
Fixed
27354d56563b0acb54eb9dd92edbc167612b9d4b
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.11.4"
        }
    ]
}

Affected versions

3.*
3.9.10
3.9.11
3.9.12
3.9.13
3.9.14
3.9.15
3.9.16
3.9.17
3.9.18
3.9.19
3.9.3
3.9.4
3.9.5
3.9.6
3.9.7
3.9.8
3.9.9
v3.*
v3.10.0
v3.10.1
v3.10.2
v3.10.3
v3.10.4
v3.10.5
v3.11.0
v3.11.1
v3.11.2
v3.11.3
v3.9.0
v3.9.1
v3.9.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47209.json"