CVE-2026-44004Public exploitNetwork attack vector

Host process crash via unbounded Buffer allocation

Published May 13, 2026 · Updated May 13, 2026

Denial of service in Patrik Simek vm2 3.10.5 and earlier allows attackers to crash the host process through sandboxed code. The bridge exposes host Buffer.alloc without validating its requested size, and the synchronous native allocation bypasses the VM timeout. Exploitation requires control of code executed in a vm2 sandbox; memory-constrained hosts can terminate immediately from heap exhaustion.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Patrik Simek vm2 3.10.5 and earlier allows attackers to crash the host process through sandboxed code. The bridge exposes host Buffer.alloc without validating its requested size, and the synchronous native allocation bypasses the VM timeout. Exploitation requires control of code executed in a vm2 sandbox; memory-constrained hosts can terminate immediately from heap exhaustion.

The record

CVE
CVE-2026-44004
Published
May 13, 2026
Updated
May 13, 2026
Vendor
Patrik Simek
Product
vm2
Classifications
CWE-770, CWE-1285, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.11.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Patrik Simek · vm2version=< 3.11.0

Published CVSS scores

8.6Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-1285Improper Validation of Specified Index, Position, or Offset in Input
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo