CVE-2026-43898
Critical
Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.
SeverityCritical
CVSS10.0
Exploit probability—
ProductNyariv Sandboxjs
PublishedMay 28, 2026
First seenMay 28, 2026
Weakness typeCWE-94Code injection
How to fix
Update
- nyariv sandboxjs0.9.6 or later
- @nyariv/sandboxjs0.9.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nyariv sandboxjs | v < 0.9.6 | 0.9.6 |
| @nyariv/sandboxjsnpm | v < 0.9.6 | 0.9.6 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.