CVE-2026-47683Public exploitNetwork attack vector

Host memory exhaustion via uncapped Buffer allocation

Published Aug 17, 2026 · Updated Aug 18, 2026

Denial of service in Patrik Simek vm2 before 3.11.6 allows remote attackers to crash the host process via crafted sandbox Buffer calls. In lib/setup-sandbox.js, bufferAllocLimit checks wrap Buffer.alloc variants but leave Buffer.concat(list, totalLength) and Buffer.from(arrayLike) able to reach Node's host allocator with attacker-controlled sizes. Exposure requires an application to execute untrusted code in vm2 with bufferAllocLimit enabled; successful exploitation exhausts host memory and causes process termination rather than sandbox escape.

CVSS severity8.7
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Patrik Simek vm2 before 3.11.6 allows remote attackers to crash the host process via crafted sandbox Buffer calls. In lib/setup-sandbox.js, bufferAllocLimit checks wrap Buffer.alloc variants but leave Buffer.concat(list, totalLength) and Buffer.from(arrayLike) able to reach Node's host allocator with attacker-controlled sizes. Exposure requires an application to execute untrusted code in vm2 with bufferAllocLimit enabled; successful exploitation exhausts host memory and causes process termination rather than sandbox escape.

The record

CVE
CVE-2026-47683
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Patrik Simek
Product
vm2
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 3.11.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Patrik Simek · vm2version=< 3.11.6

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1499Endpoint Denial of Service

Public exploit references

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

Technologies

Your stack

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Your stack

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