Sandbox Bypass

published 2022-02-11 4 y ago modified 2026-07-08 4 mo ago also GHSA-6pw2-5hjv-9pf7 , EUVD-2022-0867

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.9%; EPSS 2.9% chance of exploitation in 30 days, percentile 86%
public exploits: 0; none known

The package vm2 before 3.9.6 are vulnerable to Sandbox Bypass via direct access to host error objects generated by node internals during generation of a stacktraces, which can lead to execution of arbitrary code on the host machine.

Patch / fix

fixed in 2 links 2

npm vm2 3.9.6
n/a vm2 3.9.6

github.com/patriksimek/vm2@532120d commit
snyk.io/vuln/SNYK-JS-VM2-2309905 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-23555 updated 2026-01-21 cvss 9.8

vm2: vulnerable to Sandbox Bypass

Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/console-rhel8
affected: no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.88% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

snyk.io https://snyk.io/vuln/SNYK-JS-VM2-2309905 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	vm2	<3.9.6	3.9.6

Affected products

n/a vm2

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

github.com /patriksimek/vm2/commit/532120d5cdec7da8225fc6242e154ebabc63fe4d
web, patch, third-party-advisory
snyk.io /vuln/SNYK-JS-VM2-2309905
web, exploit, patch, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-23555
advisory
github.com /patriksimek/vm2
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary