VULNERABILITY INTELLIGENCE

CVE-2026-25586

CVSS score10 CRITICAL
EPSS probability0.70%
CISA KEVNot currently listed
Published2026-02-06
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Description

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 access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.

Weakness classification

  • security-advisories@github.com: CWE-74

Primary references