CVE-2026-25520
Critical
Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.
SeverityCritical
CVSS10.0
Exploit probability—
ProductNyariv Sandboxjs
PublishedFeb 6, 2026
First seenFeb 6, 2026
Weakness typeCWE-74Injection
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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