CVE-2026-92956

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-17. a secondary CVSS source baseline 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

vm2 versions 3.10.1 through 3.11.6 contain a sandbox escape reachable from a default new VM() sandbox when running on Node.js 26. WebAssembly.compileStreaming and WebAssembly.instantiateStreaming can produce a raw host-realm Promise that rejects with a host-realm error object; by controlling Symbol.species via Promise.prototype.finally, sandbox code receives that raw host error, walks from the host error constructor to the host Function constructor, and recovers the real host process object, gaining host Node.js capabilities (e.g. access to host modules such as fs) in the context of the process running the sandbox. No NodeVM, require permission, host object injection, or otherwise unsafe configuration is required. This is a bypass of the fix for GHSA-6j2x-vhqr-qr7q, which removed the JSPI entry points WebAssembly.promising and WebAssembly.Suspending. The issue is fixed in 3.11.7.

CVSS v3
10.0
EG Score
10.0(high)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

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 computed
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Sep 17, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

vm2 3.10.1 through 3.11.6 Sandbox Escape via WebAssembly.compileStreaming | Advisories | VulnCheck

https://www.vulncheck.com/advisories/vm2-3.10.1-through-3.11.6-sandbox-escape-via-webassembly-compilestreaming
github Patch Available🟡 PoC Available

vm2 sandbox escape via WebAssembly.compileStreaming Promise species bypass · Advisory · patriksimek/vm2 · GitHub

https://github.com/patriksimek/vm2/security/advisories/GHSA-wjwh-qqvp-g4p4

Vendor Advisories for CVE-2026-92956(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 25× in last 7d / 25× 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.

  1. 2026-09-19 23:15 UTCGHSA enrichment
  2. 2026-09-19 19:21 UTCEG score recompute
  3. 2026-09-19 19:21 UTCGHSA enrichment
  4. 2026-09-19 15:27 UTCGHSA enrichment
  5. 2026-09-19 11:32 UTCGHSA enrichment
  6. 2026-09-19 07:37 UTCGHSA enrichment
  7. 2026-09-19 03:43 UTCGHSA enrichment
  8. 2026-09-18 23:48 UTCGHSA enrichment
  9. 2026-09-18 19:55 UTCEG score recompute
  10. 2026-09-18 19:55 UTCGHSA enrichment
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-18 15:59 UTCGHSA enrichment
  13. 2026-09-18 12:03 UTCGHSA enrichment
  14. 2026-09-18 08:09 UTCGHSA enrichment
  15. 2026-09-18 04:15 UTCGHSA enrichment
  16. 2026-09-18 00:21 UTCGHSA enrichment
  17. 2026-09-17 20:27 UTCEG score recompute
  18. 2026-09-17 20:27 UTCGHSA enrichment
  19. 2026-09-17 19:30 UTCEG score recompute
  20. 2026-09-17 19:30 UTCGHSA enrichment
  21. 2026-09-17 18:18 UTCEG score recompute
  22. 2026-09-17 18:18 UTCGHSA enrichment
  23. 2026-09-17 14:22 UTCEG score recompute
  24. 2026-09-17 13:50 UTCEG score recompute
  25. 2026-09-17 13:49 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-92956?
CVE-2026-92956 is a critical vulnerability published on September 17, 2026. vm2 versions 3.10.1 through 3.11.6 contain a sandbox escape reachable from a default new VM() sandbox when running on Node.js 26. WebAssembly.compileStreaming and WebAssembly.instantiateStreaming can produce a raw host-realm Promise that rejects with a host-realm error object; by controlling…
When was CVE-2026-92956 disclosed?
CVE-2026-92956 was first published in the National Vulnerability Database on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92956 actively exploited?
CVE-2026-92956 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 65.7% of all scored CVEs.
What is the CVSS score of CVE-2026-92956?
CVE-2026-92956 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-92956?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92956, 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

Explore the affected products and dependency analysis for CVE-2026-92956

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