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Critical, CVSS 10.0amended

vm2 Access to Host Object Enables Sandbox Escape

CVE-2026-43997GHSA-47x8-96vw-5wg6

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (vm2 3.11.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm vm2

    Affected
    <= 3.10.5
    Fixed in
    3.11.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
10.0 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS
  • CVE-2026-43997: 0.98% estimated exploitation activity in the next 30 days; percentile 62.15 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary It is possible to obtain the host Object, https://github.com/patriksimek/vm2/commit/ebcfe94ad2f864f0bc35e78cff1d921107cfd160 added some protections, but the implementation is incomplete. Details There are various ways to use the host Object, to escape the sandbox, one example would be using HostObject.getOwnPropertySymbols to obtain Symbol(nodejs.util.inspect.custom) PoC Impact Sandbox Escape - RCE

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-47x8-96vw-5wg6

  2. Revision 2 · amended ·

    Amended from osv record GHSA-47x8-96vw-5wg6

  3. Revision 1 · created ·

    Published from ghsa record GHSA-47x8-96vw-5wg6

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-43997

Advisory: vm2 Access to Host Object Enables Sandbox Escape
IDs: CVE-2026-43997, GHSA-47x8-96vw-5wg6
Record: https://patchnext.com/advisories/cve-2026-43997 (revision 3, source checked 26 Oct 2026, 12:52 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 10.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: vm2 3.11.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm vm2: affected <= 3.10.5; fixed in 3.11.0

## Suggested inspection (read-only)
- `npm ls vm2 --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on vm2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-47x8-96vw-5wg6 (GitHub-reviewed advisory GHSA-47x8-96vw-5wg6 lists affected ranges: npm vm2 >=0 <=3.10.5)
- Verified: https://osv.dev/vulnerability/GHSA-47x8-96vw-5wg6 (OSV record GHSA-47x8-96vw-5wg6 lists affected ranges: npm vm2 >=0 <3.11.0 (fixed))

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