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Vulnerability record · CVE-2026-47683 · published 17 August 2026

CVE-2026-47683: Allocation without limits vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.54% · top 57.0% CWE-770 · Allocation without limits Deferred
8.7CVSS 4.0 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
9 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-47683), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.