CVE-2026-43997: vm2: Sandbox Escape

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-13 · updated 2026-10-26
Weakness: CWE-94

Description

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, it is possible to obtain the host Object. There are various ways to use the host Object, to escape the sandbox, one example would be using HostObject.getOwnPropertySymbols to obtain Symbol(nodejs.util.inspect.custom). This vulnerability is fixed in 3.11.0.

Affected products

patriksimek vm2: before 3.11.0 — fixed in 3.11.0

How to fix

Upgrade to a fixed version: patriksimek vm2 3.11.0. Check the vendor advisory for mitigations.

References

https://github.com/patriksimek/vm2/security/advisories/GHSA-47x8-96vw-5wg6
https://access.redhat.com/errata/RHSA-2026:50850
https://access.redhat.com/security/cve/CVE-2026-43997
https://bugzilla.redhat.com/show_bug.cgi?id=2477203
https://github.com/patriksimek/vm2/security/advisories/GHSA-47x8-96vw-5wg6
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43997.json

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