CVE-2026-47683 — vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike
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…
Published: 2026-08-17 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7