Vulnerability in Nyariv Sandboxjs
CVE-2026-25586
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct ac…
EPSS: 0.000 (10.3th 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
- https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48 (x_refsource_CONFIRM)
- https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-25586?
- CVE-2026-25586 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-2026-25586?
- Critical severity. CVSS v3 base score is 10.0 out of 10.