EUVD-2026-12043
GHSA-6r9f-759j-hjgv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionGitHub Advisory
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. Given an array containing Function, and Object.fromEntries, it is possible to construct {[p]: Function} where p is any constructible property. This vulnerability is fixed in 0.8.34.
AnalysisAI
SandboxJS sandbox escape before 0.8.34 via Function access through arrays. CVSS 10.0.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | SandboxJS versions prior to 0.8.34 with Object.fromEntries available in sandbox context. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 10.0. Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Obtain Function constructor through arrays to escape sandbox. |
| Remediation | Update. Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all applications and dependencies using SandboxJS to identify exposure scope; isolate or disable affected services if operationally feasible. …
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