What’s Vulnerable › Vulnerabilities

CVE-2026-44004: vm2: Host Process OOM DoS via Buffer.alloc (Timeout Bypass)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-13 · updated 2026-10-26
• Weakness: CWE-770

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.

Affected products

• patriksimek vm2: before 3.11.0 — fixed in 3.11.0

How to fix

Upgrade to a fixed version: patriksimek vm2 3.11.0. Check the vendor advisory for mitigations.

References

• https://github.com/patriksimek/vm2/security/advisories/GHSA-6785-pvv7-mvg7
• 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
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44004.json

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