CVE-2026-44004 Details
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.
A denial-of-service vulnerability has been identified in vm2, a sandboxing library for Node.js, affecting versions prior to 3.11.0. The issue arises because sandboxed code can invoke Buffer.alloc() with any size, allocating memory directly on the host heap. This allocation occurs through a synchronous C++ native call, which vm2's timeout option cannot interrupt. As a result, a single request can deplete host memory, causing the process to crash with a fatal error indicating that the heap limit has been reached.
Users are advised to update vm2 to version 3.11.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2026:50850 | redhat-SADP | |
| https://access.redhat.com/security/cve/CVE-2026-44004 | redhat-SADP | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2477195 | redhat-SADP | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44004.json | redhat-SADP | |
| https://github.com/patriksimek/vm2/security/advisories/GHSA-6785-pvv7-mvg7 | CISA-ADP | ExploitVendor Advisory |
| https://github.com/patriksimek/vm2/security/advisories/GHSA-6785-pvv7-mvg7 | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1285 | Improper Validation of Specified Index, Position, or Offset in Input | redhat-SADP |
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| vm2 project vm2 | < 3.11.0 |
CPE
Remediation
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Change History
8 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 6, 2026 | CVE Modified | redhat-SADP |
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| May 14, 2026 | Initial Analysis | [email protected] |
| May 13, 2026 | CVE Modified | CISA-ADP |
| May 13, 2026 | New CVE Received | [email protected] |