CVE-2026-47683

vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike

At a glance

Severity: HIGH 8.7
EPSS: EPSS 0.54 % · percentile 45 (2026-10-27)
State: PUBLISHED
Published: 2026-08-17
Updated: 2026-08-18
Assigner: GitHub_M
NVD status: Deferred

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.

Scores

Version	Score	Vector	Scored by
CVSS 4.0	HIGH 8.7	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	GitHub_M
CVSS 4.0	HIGH 8.7	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:X/V:X/RE:X/U:X	NVD · security-advisories@github.com (Secondary)

Weaknesses (CWE)

CWE-770

Advisories

GHSA-gmc2-2x9w-cgh9 — vm2's bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike

European references

ENISA EUVD · EUVD-2026-60461
GCVE · GCVE-0-2026-47683

Affected products

Product	Versions
patriksimek · vm2	affected < 3.11.6

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD