CVE-2026-26956: vm2: WASM Sandbox Escape (Node 25 only)

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-04 · updated 2026-10-26
Weakness: CWE-693

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.

Affected products

patriksimek vm2: before 3.10.5 — fixed in 3.10.5

How to fix

Upgrade to a fixed version: patriksimek vm2 3.10.5. Check the vendor advisory for mitigations.

References

https://github.com/patriksimek/vm2/releases/tag/v3.10.5
https://github.com/patriksimek/vm2/security/advisories/GHSA-ffh4-j6h5-pg66
https://access.redhat.com/security/cve/CVE-2026-26956
https://bugzilla.redhat.com/show_bug.cgi?id=2466548
https://github.com/patriksimek/vm2/security/advisories/GHSA-ffh4-j6h5-pg66
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26956.json

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