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Vulnerability record · CVE-2026-44004 · published 13 May 2026

CVE-2026-44004: Vm2 project vm2 allocation without limits vulnerability

Vm2 Project · Vm2

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, sandboxed code can call Buffer.alloc() with an arbitrary size to allocate memory directly on the host heap. Because Buffer.alloc is a synchronous C++ native call, vm2's timeout option cannot interrupt it. A single request can exhaust host memory and crash the process with a FATAL ERROR: Reached heap limit. This vulnerability is fixed in 3.11.0.

7.5 CVSS 3.1 High EPSS 0.66% · top 50.2% CWE-770 · Allocation without limitsCWE-1285 · CWE-1285
7.5CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
6 Aug 2026Last modified by NVD

Description

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, sandboxed code can call Buffer.alloc() with an arbitrary size to allocate memory directly on the host heap. Because Buffer.alloc is a synchronous C++ native call, vm2's timeout option cannot interrupt it. A single request can exhaust host memory and crash the process with a FATAL ERROR: Reached heap limit. This vulnerability is fixed in 3.11.0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/patriksimek/vm2/security/advisories/GHSA-6785-pvv7-mvg7 ExploitVendor Advisory
https://access.redhat.com/errata/RHSA-2026:50850
https://access.redhat.com/security/cve/CVE-2026-44004
https://bugzilla.redhat.com/show_bug.cgi?id=2477195
https://github.com/patriksimek/vm2/security/advisories/GHSA-6785-pvv7-mvg7 ExploitVendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44004.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-44004), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.