GHSA-43rv-jrfh-9mrr

Suggest an improvement
Source
https://github.com/advisories/GHSA-43rv-jrfh-9mrr
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-43rv-jrfh-9mrr/GHSA-43rv-jrfh-9mrr.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-43rv-jrfh-9mrr
Withdrawn
2026-10-05T22:59:44Z
Published
2026-09-27T03:31:03Z
Modified
2026-10-05T23:15:03Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N CVSS Calculator
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
Duplicate Advisory: vm2: NodeVM zlib Buffers expose pooled host memory across the VM boundary
Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-489w-w794-jq94. This link is maintained to preserve external references.

Original Description

vm2 before 3.12.2 does not apply its Buffer backing-store ownership invariant (byteOffset === 0 and buffer.byteLength === length) to Buffers returned from host builtin modules. When an application explicitly exposes Node's zlib module through NodeVM's builtin allowlist (require: { builtin: ['zlib'] }), zlib.deflateSync can return a Buffer backed by Node's shared small-buffer pool whose .buffer is the entire pool. Untrusted guest code can construct a full-width view of that ArrayBuffer (Buffer.from(result.buffer, 0, result.buffer.byteLength)) to read and modify bytes belonging to unrelated host buffers, disclosing and corrupting host-realm memory across the sandbox boundary.

Database specific 
{
    "cwe_ids": [
        "CWE-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-05T22:59:44Z",
    "nvd_published_at": "2026-09-27T02:17:19Z",
    "severity": "MODERATE"
}
References

Affected packages

npm / vm2

Package

Name
vm2
View open source insights on deps.dev
Purl
pkg:npm/vm2

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.12.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-43rv-jrfh-9mrr/GHSA-43rv-jrfh-9mrr.json"