vm2 before 3.12.2 Memory Disclosure via zlib Buffer Pool
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| patriksimek | vm2 | before 3.12.2 | 3.12.2 | Patch available | CNA |
| — | vm2 (npm) | before 3.12.2 | 3.12.2 | Patch available | GHSA-489w-w794-jq94 |
- vm2 Vendorpatriksimek Affected before 3.12.2 Fixed in 3.12.2 Patch available CNA
- vm2 (npm) Vendor— Affected before 3.12.2 Fixed in 3.12.2 Patch available GHSA-489w-w794-jq94
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:vm2_project:vm2:*:*:*:*:*:*:*:* | — | — | patriksimek |
- cpe:2.3:a:vm2_project:vm2:*:*:*:*:*:*:*:* Versions — — ·patriksimek
Remediation
- Fix · CNA vm2 (patriksimek) Fixed in 3.12.2
- Fix · GHSA-489w-w794-jq94 vm2 (npm) Fixed in 3.12.2 Advisory →
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
patriksimek vm2 3.12.2
3 records Highest priority Priority HIGH 2 HIGH, 1 MEDIUM
Other records, highest priority first
- TI-2026-64877 vm2 before 3.12.2 Authorization Bypass via Custom ResolverPriority HIGH 76
- TI-2026-64878 vm2 before 3.12.2 Host Process Termination via Construct TrapPriority HIGH 72
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 2 products
- Red Hat Developer Hub 1
- Self-service automation portal 2
Timeline
- 2026-10-02 Threatist record created from CVE-2026-100723
- 2026-10-03 Alias added: GHSA-43rv-jrfh-9mrr
- 2026-10-06 Alias added: GHSA-489w-w794-jq94
- 2026-10-06 Fix available: npm/[email protected] · GHSA-489w-w794-jq94
- 2026-10-06 CVSS score added · GHSA-489w-w794-jq94
- 2026-10-06 Weakness changed · GHSA-489w-w794-jq94
- 2026-10-06 6 new references · GHSA-489w-w794-jq94
- 2026-10-27 Affected versions changed · Red Hat
References
More patriksimek vulnerabilities
- TI-2023-14382 Sandbox Escape in vm2 CVSS 3.1CRITICAL 10.0
- TI-2023-13478 vm2 Sandbox Escape vulnerability CVSS 3.1CRITICAL 10.0
- TI-2026-63070 vm2 before 3.12.1 Sandbox Escape via Promise Symbol.species CVSS 4.0CRITICAL 10.0
- TI-2026-63067 vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function CVSS 4.0CRITICAL 10.0
- TI-2026-62623 vm2 before 3.11.6 Process-wide State Exposure via os and dns CVSS 4.0CRITICAL 10.0
- TI-2026-62618 vm2 before 3.11.8 Sandbox Escape via NodeVM CVSS 4.0CRITICAL 10.0
Sources
- CVE-2026-100723 · CVE Program
- CVE-2026-100723 · NVD
- FIRST EPSS
- GHSA-43rv-jrfh-9mrr · GitHub Advisory Database · CC BY 4.0
- GHSA-489w-w794-jq94 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-100723 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences