CVE-2026-26956: vm2 is an open source vm/sandbox for Node.js

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-26956 is a critical-severity flaw (CVSS 9.8) affecting vm2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

vm2 is an open source vm/sandbox for Node.js. In version 3.10.4, vm2 is vulnerable to full sandbox escape with arbitrary code execution. Attacker code inside VM.run() obtains host process object and runs host commands with zero host cooperation. This issue has been patched in version 3.10.5.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-693, CWE-653
Published	2026-05-04
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: vm2 project

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-04 17:16 UTCPublished CVE record published
2026-10-26 19:10 UTCUpdated Record last modified

vm2 project vm2 UPGRADE

Affected: < 3.10.5

Fixed in: 3.10.5

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls vm2

2. UPGRADE to 3.10.5

npm install vm2@">=3.10.5"

Exact fixes by distribution

npm · vm2 · FIXED · 3.10.5 · vulnerable: <= 3.10.4 · source

npm install vm2@">=3.10.5" npm ls vm2

Fedora 46 · ddnet · FIXED · 20.2-1.fc46 · FEDORA-2026-6991b4ab14 · source

sudo dnf upgrade --advisory=FEDORA-2026-6991b4ab14

Fedora ELN · libplacebo · FIXED · 7.360.1-5.eln159 · FEDORA-2026-92226f221e · source

sudo dnf upgrade --advisory=FEDORA-2026-92226f221e

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/patriksimek/vm2/security/advisories/GHSA-ffh4-j6h5-pg66

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-26956?

vm2: upgrade to 3.10.5. Exact commands for each OS are on this page.

Is CVE-2026-26956 being exploited?

CVE-2026-26956 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-26956 affect?

CVE-2026-26956 affects vm2. Severity is critical (CVSS 9.8). vm2 is an open source vm/sandbox for Node.js. In version 3.10.4, vm2 is vulnerable to full sandbox escape with arbitrary code execution. Attacker code inside VM.run() obtains host process object and runs host commands with zero host coopera

How urgent is CVE-2026-26956?

Priority 64/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

Related CVEs

CVE-2026-24781 CRITICAL 9.8 UPGRADE vm2 is an open source vm/sandbox for Node.js
CVE-2026-24118 CRITICAL 9.8 UPGRADE vm2 is an open source vm/sandbox for Node.js
CVE-2026-26332 CRITICAL 9.8 UPGRADE vm2 is an open source vm/sandbox for Node.js
CVE-2026-43997 CRITICAL 10.0 UPGRADE vm2 is an open source vm/sandbox for Node.js
CVE-2026-44005 CRITICAL 10.0 UPGRADE vm2 is an open source vm/sandbox for Node.js

References

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