CVE-2026-47683: Patriksimek VM2

High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days.

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.6, the bufferAllocLimit enforcement in lib/setup-sandbox.js does not cover Buffer.concat(list, totalLength) or Buffer.from(arrayLike) with an attacker-controlled length, allowing sandbox code to perform large synchronous host external-memory allocations that bypass the configured cap and can exhaust the host process. This issue is fixed in version 3.11.6.

Affected products

• Patriksimek VM2: before 3.11.6 (fixed in 3.11.6)

Published 2026-08-17. Last modified 2026-09-09.