Vulnerability in Nyariv Sandboxjs
CVE-2026-25520
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at…
EPSS: 0.008 (52.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Nyariv Sandboxjs — versions < 0.8.29
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-25520?
- CVE-2026-25520 is a critical-severity vulnerability in Nyariv Sandboxjs, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 10.0/10. Published 2026-02-06.
- How severe is CVE-2026-25520?
- Critical severity. CVSS v3 base score is 10.0 out of 10.