by Kastro
Paper/Archive/CVE-2026-26954

CVE-2026-26954

nyariv SandboxJS — SandboxJS has a Sandbox Escape

EPSS 0.6%public exploitCVSS 10.0
critical.is priorityof 100
49
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 47.1.471 × 209.4Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
SandboxJS< 0.8.34–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgv