vm2 before 3.12.2 Memory Disclosure via zlib Buffer Pool
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.
CVE-2026-100723
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-100723
vm2
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "patriksimek",
"product": "vm2",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "3.12.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "3.12.2",
"versionType": "semver"
}
],
"packageURL": "pkg:npm/vm2",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-100723
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #7613 · Revision 1
- Added to Heist Feed
- Publisher date