CVE-2026-25586
CVE-2026-25586 · SandboxJS has a Sandbox Escape via Prototype Whitelist Bypass and Host Prototype Pollution
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 10.0 · Critical · EPSS 0.7% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
sandboxjs
- Versions
- < 0.8.29: Affected
No fix published
@nyariv/sandboxjs npm
- Affected ranges
- SEMVER: < 0.8.29
Update to 0.8.29