CVE-2026-34217
High
Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, a scope modification vulnerability exists in @nyariv/sandboxjs. The vulnerability allows untrusted sandboxed code to leak internal interpreter objects through the new operator, exposing sandbox scope objects in the scope hierarchy to untrusted code; an unexpected and undesired exploit. While this could allow modifying scopes inside the sandbox, code evaluation remains sandboxed and prototypes remain protected throughout the execution. This vulnerability is fixed in 0.8.36.
SeverityHigh
CVSS7.2
Exploit probability—
ProductNyariv Sandboxjs
PublishedApr 6, 2026
First seenApr 6, 2026
Weakness typeCWE-668CWE-668
How to fix
Update
- nyariv sandboxjs0.8.36 or later
- @nyariv/sandboxjs0.8.36 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nyariv sandboxjs | v < 0.8.36 | 0.8.36 |
| @nyariv/sandboxjsnpm | v < 0.8.36 | 0.8.36 |
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