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CVE-2026-26954

Critical

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. Given an array containing Function, and Object.fromEntries, it is possible to construct {[p]: Function} where p is any constructible property. This vulnerability is fixed in 0.8.34.

SeverityCritical
CVSS10.0
Exploit probability—
ProductNyariv Sandboxjs
PublishedMar 13, 2026
First seenMar 13, 2026
Weakness typeCWE-94Code injection

How to fix

Update
  • nyariv sandboxjs0.8.34 or later
  • @nyariv/sandboxjs0.8.34 or later

Affected products

ProductAffected versionsFixed in
nyariv sandboxjsv < 0.8.340.8.34
@nyariv/sandboxjsnpmv < 0.8.340.8.34

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