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.
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| @nyariv/sandboxjs | โ | โ |
| sandboxjs | โ | 0.8.29 |
References
Similar Threats
- Critical CVE-2026-43898
- Critical CVE-2026-34208
- High CVE-2026-34211
- High CVE-2026-34217
- Medium CVE-2026-32723
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