CVE-2026-44005: vm2 is an open source vm/sandbox for Node.js

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CRITICAL 10.0REMOTEUPGRADE

CVE-2026-44005 is a critical-severity flaw (CVSS 10.0) 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. From 3.9.6 to 3.10.5, vm2's bridge exposes mutable proxies for real host-realm intrinsic prototypes and then forwards sandbox writes into the underlying host objects with otherReflectSet() and otherReflectDefineProperty(), which lets attacker-controlled JavaScript running in a default VM or inherited NodeVM mutate shared host Object.prototype, Array.prototype, and Function.prototype from inside the sa

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	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-94, CWE-1321, CWE-653
Published	2026-05-13
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

2026-05-13 18:16 UTCPublished CVE record published
2026-10-26 17:10 UTCUpdated Record last modified

vm2 project vm2 UPGRADE

Affected: >= 3.9.6 and < 3.11.0

Fixed in: 3.11.0

Safe to downgrade to: a release before 3.9.6

1. Check installed version

npm ls vm2

2. UPGRADE to 3.11.0

npm install vm2@">=3.11.0"

3. If no update is available yet, DOWNGRADE to a release before 3.9.6

npm view vm2 versions npm install vm2@"<3.9.6"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

npm · vm2 · FIXED · 3.11.0 · vulnerable: >= 3.9.6, <= 3.10.5 · source

npm install vm2@">=3.11.0" npm ls vm2

Fedora 46 · fio · FIXED · 3.43-2.fc46 · FEDORA-2026-b36219886b · source

sudo dnf upgrade --advisory=FEDORA-2026-b36219886b

Fedora ELN · weston · FIXED · 16.0.2-1.eln159 · FEDORA-2026-b98ccaa6a0 · source

sudo dnf upgrade --advisory=FEDORA-2026-b98ccaa6a0

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-vwrp-x96c-mhwq

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-2026-44005?

vm2: upgrade to 3.11.0. Exact commands for each OS are on this page.

Is CVE-2026-44005 being exploited?

CVE-2026-44005 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-2026-44005 affect?

CVE-2026-44005 affects vm2. Severity is critical (CVSS 10.0). vm2 is an open source vm/sandbox for Node.js. From 3.9.6 to 3.10.5, vm2's bridge exposes mutable proxies for real host-realm intrinsic prototypes and then forwards sandbox writes into the underlying host objects with otherReflectSet() and o

How urgent is CVE-2026-44005?

Priority 62/100. 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

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References

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