Protection Mechanism Failure in vm2 - CVE-2026-26956
Published: May 4, 2026
Vulnerability identifier: #VU129593
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-26956
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Patrik Simek
Affected software:
vm2
vm2
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a protection mechanism failure in VM.run() when processing attacker-controlled code that uses WebAssembly exception handling with JSTag support. A remote attacker can supply specially crafted code to obtain the host process object and execute arbitrary code.
Exploitation requires a Node.js version with WebAssembly exception handling and JSTag support.
How to mitigate CVE-2026-26956
Install security update from vendor's website.