CVE-2026-25587
Critical
Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, as Map is in SAFE_PROTOYPES, it's prototype can be obtained via Map.prototype. By overwriting Map.prototype.has the sandbox can be escaped. This vulnerability is fixed in 0.8.29.
SeverityCritical
CVSS10.0
Exploit probability—
ProductNyariv Sandboxjs
PublishedFeb 6, 2026
First seenFeb 6, 2026
Weakness typeCWE-94Code injection
How to fix
Update
- nyariv sandboxjs0.8.29 or later
- @nyariv/sandboxjs0.8.29 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nyariv sandboxjs | v < 0.8.29 | 0.8.29 |
| @nyariv/sandboxjsnpm | v < 0.8.29 | 0.8.29 |
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