Improperly Controlled Modification of Dynamically-Determined Object Attributes Affecting vm2 package, versions <3.11.4
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published31 May 2026
- disclosed29 May 2026
- creditq1uf3ngONEKEY
Introduced: 29 May 2026
NewCVE-2026-47209 (opens in a new tab)How to fix?
Upgrade vm2 to version 3.11.4 or higher.
Overview
vm2 is a sandbox that can run untrusted code with whitelisted Node's built-in modules.
Affected versions of this package are vulnerable to Improperly Controlled Modification of Dynamically-Determined Object Attributes via the BaseHandler.set trap in lib/bridge.js. An attacker can mutate host-realm objects or install attacker-controlled hooks by writing through an inherited object or a forged Reflect.set receiver, causing sandbox-supplied values to be written to the wrapped host object instead of the intended receiver. This lets sandbox code pollute host-side properties on any embedder-exposed object, including dispatch slots used by host code, potentially leading to host-side code execution when the polluted property is later consumed.