CVE-2026-26956

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 68% 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, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

vm2 is an open source vm/sandbox for Node.js. In version 3.10.4, vm2 is vulnerable to full sandbox escape with arbitrary code execution. Attacker code inside VM.run() obtains host process object and runs host commands with zero host cooperation. This issue has been patched in version 3.10.5.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
56.3%
KEV
Not listed

Published

May 4, 2026

Last Modified

July 15, 2026

Advisory Details (5)

Auto-updated Jul 16, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, redhat.
redhat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26956.json
github Patch Available🟡 PoC Available

WASM Sandbox Escape · Advisory · patriksimek/vm2 · GitHub

https://github.com/patriksimek/vm2/security/advisories/GHSA-ffh4-j6h5-pg66
redhat

2466548 – (CVE-2026-26956) CVE-2026-26956 vm2: Node.js: vm2: Arbitrary code execution via sandbox escape

https://bugzilla.redhat.com/show_bug.cgi?id=2466548
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-26956
github_release Patch Available

v3.10.5

Patch available: patriksimek/vm2 v3.10.5

https://github.com/patriksimek/vm2/releases/tag/v3.10.5

Vendor Advisories for CVE-2026-26956(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)
PackageVulnerable rangeFixed inDependents
vm2—3.10.5—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 50× 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.

Showing the most recent 100 of 193 total refreshes for this CVE.

  1. 2026-07-16 17:03 UTCEPSS rescore
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  3. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-30 23:22 UTCEPSS rescore
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  27. 2026-06-15 17:48 UTCEPSS rescore
  28. 2026-06-15 06:40 UTCEG score recompute
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  74. 2026-06-07 16:36 UTCEG score recompute
  75. 2026-06-07 15:25 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-26956?
CVE-2026-26956 is a critical vulnerability published on May 4, 2026. vm2 is an open source vm/sandbox for Node.js. In version 3.10.4, vm2 is vulnerable to full sandbox escape with arbitrary code execution. Attacker code inside VM.run() obtains host process object and runs host commands with zero host cooperation. This issue has been patched in version 3.10.5.
When was CVE-2026-26956 disclosed?
CVE-2026-26956 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26956 actively exploited?
CVE-2026-26956 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 56.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-26956?
CVE-2026-26956 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-26956?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26956, 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

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