Vulnerability · Published Aug 17, 2026 · Assigned by GitHub_M

CVE-2026-47698vm2: Sandbox Breakout Using Dangerous Host Proto Mutators

Critical 9.8

In plain English

A critical-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 1.0% (higher than 62% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.0%top 37.9% 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 3.11.6, lib/bridge.js and lib/setup-sandbox.js fail to block stacked indirection through Function.prototype.call around dangerous host prototype getter and setter mutators, allowing sandbox code to sever a host intrinsic's prototype chain and reach e.constructor.constructor for arbitrary host command execution. This issue is fixed in version 3.11.6.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	vm2	3.11.6	GHSA-cfcw-xp6x-25gj

Affected products (as reported)

Vendor	Product	Versions
patriksimek	vm2	< 3.11.6

Weakness: CWE-913 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/patriksimek/vm2/security/advisories/GHSA-cfcw-xp6x-25gj x_refsource_CONFIRM
https://github.com/patriksimek/vm2/commit/a85acb61f81402c6eabf32760aa11272af6d0f9e x_refsource_MISC
https://github.com/patriksimek/vm2/releases/tag/3.11.6 x_refsource_MISC