Vulnerability · Published Jun 12, 2026 · Assigned by GitHub_M

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

Medium 6.9

In plain English

A medium-severity security flaw in vm2 from patriksimek. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.4%top 67.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	vm2	3.11.4	GHSA-9g8x-92q2-p28f

Affected products (as reported)

Vendor	Product	Versions
patriksimek	vm2	< 3.11.4

Weakness: CWE-668 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

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