vm2: bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike
Priority HIGH 79CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-770.
Summary
vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.6, the bufferAllocLimit enforcement in lib/setup-sandbox.js does not cover Buffer.concat(list, totalLength) or Buffer.from(arrayLike) with an attacker-controlled length, allowing sandbox code to perform large synchronous host external-memory allocations that bypass the configured cap and can exhaust the host process. This issue is fixed in version 3.11.6.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00538 45th percentileScored 2026-11-07
Fix Fixed vm2 (patriksimek): 3.11.6vm2 (npm): 3.11.6Red Hat: 6 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
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 3.11.6 | 3.11.6 | Patch available | CNA |
| — | vm2 (npm) | before 3.11.6 | 3.11.6 | Patch available | GHSA-gmc2-2x9w-cgh9 |
- vm2 Vendorpatriksimek Affected before 3.11.6 Fixed in 3.11.6 Patch available CNA
- vm2 (npm) Vendor— Affected before 3.11.6 Fixed in 3.11.6 Patch available GHSA-gmc2-2x9w-cgh9
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 3.11.6
- Fix · GHSA-gmc2-2x9w-cgh9 vm2 (npm) Fixed in 3.11.6 Advisory →
Red Hat 6 advisories
- RHSA-2026:91651 Released 2026-10-28 · Red Hat rating CriticalRed Hat Developer Hub 1.9.10 release.
- Red Hat Developer Hub 1.9 registry.redhat.io/rhdh/rhdh-hub-rhel9, registry.redhat.io/rhdh/rhdh-rhel9-operator
- RHSA-2026:82151 Released 2026-10-13 · Red Hat rating CriticalAnsible automation portal Red Hat Enterprise Linux Images
- Red Hat Ansible Automation Platform 2.2 registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9
- RHSA-2026:79088 Released 2026-10-08 · Red Hat rating CriticalRed Hat Developer Hub 1.10.5 release.
- Red Hat Developer Hub 1.10 registry.redhat.io/rhdh/rhdh-hub-rhel9, registry.redhat.io/rhdh/rhdh-rhel9-operator
Show 3 more Red Hat advisories
- RHSA-2026:76788 Released 2026-10-06 · Red Hat rating CriticalRed Hat Developer Hub 1.10.5 Plugin Catalog GA plugins release.
- Red Hat Developer Hub 1.10 registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed, registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend, registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator +4
- RHSA-2026:72722 Released 2026-09-28 · Red Hat rating ImportantAnsible plug-ins for Red Hat Developer Hub Product Release Update
- Red Hat Ansible Automation Platform 2.2 registry.redhat.io/ansible-automation-platform/automation-portal
- RHSA-2026:72712 Released 2026-09-28 · Red Hat rating ImportantAnsible plug-ins for Red Hat Developer Hub Product Release Update
- Red Hat Ansible Automation Platform 2.1 registry.redhat.io/ansible-automation-platform/automation-portal
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ansible Automation Platform 2.1 | Fixed | RHSA-2026:72712 |
| Red Hat Ansible Automation Platform 2.2 | Fixed | RHSA-2026:72722, RHSA-2026:82151 |
| Red Hat Developer Hub 1.10 | Fixed | RHSA-2026:76788, RHSA-2026:79088 |
| Red Hat Developer Hub 1.9 | Fixed | RHSA-2026:91651 |
Not affected: 2 products
- Red Hat Developer Hub 1.10
- Red Hat Developer Hub 1.9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-47683
- 2026-10-03 Alias added: GHSA-gmc2-2x9w-cgh9
- 2026-10-07 Fix available: RHSA-2026:76788 · Red Hat
- 2026-10-07 Fix available: Red Hat Developer Hub 1.10 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79088 · Red Hat
- 2026-10-09 Affected versions changed · Red Hat
- 2026-10-13 Affected versions changed · Red Hat
- 2026-10-13 Fix available: RHSA-2026:82151 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:91651 · Red Hat
- 2026-10-30 Fix available: Red Hat Developer Hub 1.9 · 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-2026-47683 · CVE Program
- CVE-2026-47683 · NVD
- FIRST EPSS
- GHSA-gmc2-2x9w-cgh9 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-47683 · 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