CVE-2026-47141: vm2: NodeVM observability builtins leak host process and HTTP request data

Severity: medium (CVSS 6.9 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-12 · updated 2026-10-26
Weakness: CWE-668

Description

vm2 is an open source vm/sandbox for Node.js. Prior to version 3.11.4, NodeVM exposes some process-wide observability builtins when they are allowed through require.builtin. The diagnostics_channel, async_hooks, and perf_hooks builtins are not blocked by the dangerous builtin denylist. These modules are process-wide, not sandbox-local. Sandboxed code can use them to observe host application data across the vm2 boundary. This issue has been patched in version 3.11.4.

Affected products

patriksimek vm2: before 3.11.4

References

https://github.com/patriksimek/vm2/commit/e1c48fce05189f48e71efbd32af0754efa4066bb
https://github.com/patriksimek/vm2/releases/tag/v3.11.4
https://github.com/patriksimek/vm2/security/advisories/GHSA-9g8x-92q2-p28f
https://github.com/patriksimek/vm2/security/advisories/GHSA-9g8x-92q2-p28f

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