CVE-2026-47683
High
Description
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.
SeverityHigh
CVSS8.7
Exploit probability—
ProductVm2
PublishedAug 17, 2026
First seenAug 17, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- vm23.11.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| vm2npm | v < 3.11.6 | 3.11.6 |
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