CVE-2026-47683

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.

CVSS 4.0

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-25)

CWE

CWE-770

Published

2026-08-17

Modified

2026-10-23

Record from

the NVD, synced 2026-10-23

Packages (OSV)

References

• https://github.com/patriksimek/vm2/commit/3ffb315512e634cf85c447375e85d6c83d00a4bd
• https://github.com/patriksimek/vm2/releases/tag/3.11.6
• https://github.com/patriksimek/vm2/security/advisories/GHSA-gmc2-2x9w-cgh9
• https://github.com/patriksimek/vm2/security/advisories/GHSA-gmc2-2x9w-cgh9

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