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.
CVE-2026-47683
HIGHPre-NVD 8.78.7—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.7
- EG Score
- 8.7(medium)
- EG Risk
- 70(Attend)EG Risk 70/100SSVC: Attend
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity87% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS PROB
- 0%
- EPSS %ILE
- 24%
- KEV
- Not listed
Published
August 17, 2026
Last Modified
August 18, 2026
Advisory Details (3)
Auto-updated Aug 17, 2026🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available
v3.11.6
Patch available: patriksimek/vm2 3.11.6
https://github.com/patriksimek/vm2/releases/tag/3.11.6github_commit Patch Available
commit 3ffb315512e6 (patriksimek/vm2)
Patch available: patriksimek/vm2 3.11.6 (contains commit 3ffb315512e6)
https://github.com/patriksimek/vm2/commit/3ffb315512e634cf85c447375e85d6c83d00a4bdgithub Patch Available🟡 PoC Available
bufferAllocLimit cap bypassed by Buffer.concat and Buffer.from arrayLike · Advisory · patriksimek/vm2 · GitHub
https://github.com/patriksimek/vm2/security/advisories/GHSA-gmc2-2x9w-cgh9Vendor Advisories for CVE-2026-47683(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| vm2 | — | 3.11.6 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 10× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-20 22:55 UTCEPSS rescore
- 2026-08-19 18:36 UTCEG score recompute
- 2026-08-19 17:04 UTCEPSS rescore
- 2026-08-18 16:46 UTCEG score recompute
- 2026-08-18 15:45 UTCEG score recompute
- 2026-08-18 13:48 UTCEPSS rescore
- 2026-08-17 21:32 UTCEG score recompute
- 2026-08-17 21:05 UTCEG score recompute▲ 8.70
- 2026-08-17 21:04 UTCMITRE cvelistV5CVSS v3 → 8.7 · CVSS v4 → 8.7
- 2026-08-17 17:54 UTCEG score recompute
Frequently asked(5)
What is CVE-2026-47683?
CVE-2026-47683 is a high vulnerability published on August 17, 2026. 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…
When was CVE-2026-47683 disclosed?
CVE-2026-47683 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47683 actively exploited?
CVE-2026-47683 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 76.2% of all scored CVEs.
What is the CVSS score of CVE-2026-47683?
CVE-2026-47683 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-47683?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47683, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-47683
Is Your Infrastructure Affected by CVE-2026-47683?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.