CVE-2026-26954
Last modified
CVE-2026-26954 is a critical-severity vulnerability rated 10/10 on the CVSS scale. SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. EPSS estimates a 0.55% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nyariv | Sandboxjs | < 0.8.34 |
References
- https://github.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgvExploit, Vendor Advisory
- https://github.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgvExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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