CVE-2026-26954 CRITICAL

CVE-2026-26954: SandboxJS has a Sandbox Escape

Vendor Nyariv
Product SandboxJS
Weakness CWE-94 · Code injection
Published March 13, 2026
Last update March 16, 2026
View on NVD All CVEs

CVSS base score

10.0/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 13, 2026 CVE published
March 16, 2026 Record updated