Critical severity · published May 4, 2026
CVE-2026-26956
vm2: WASM Sandbox Escape (Node 25 only)
9.8
CVSS
1.1%
EPSS
No
On KEV
Description
vm2 is an open source vm/sandbox for Node.js. In version 3.10.4, vm2 is vulnerable to full sandbox escape with arbitrary code execution. Attacker code inside VM.run() obtains host process object and runs host commands with zero host cooperation. This issue has been patched in version 3.10.5.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VM
vm2 · patriksimek
= 3.10.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26956
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26956
Release Notes
https://github.com/patriksimek/vm2/releases/tag/v3.10.5
Exploit
https://github.com/patriksimek/vm2/security/advisories/GHSA-ffh4-j6h5-pg66
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-26956
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2466548
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26956.json
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