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.
History

Mon, 09 Feb 2026 11:00:00 +0000

Type Values Removed Values Added
First Time appeared Nyariv
Nyariv sandboxjs
Vendors & Products Nyariv
Nyariv sandboxjs

Fri, 06 Feb 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 06 Feb 2026 20:00:00 +0000

Type Values Removed Values Added
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.
Title SandboxJS has a Sandbox Escape
Weaknesses CWE-74
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-02-06T19:53:24.219Z

Updated: 2026-02-06T20:18:08.646Z

Reserved: 2026-02-02T18:21:42.487Z

Link: CVE-2026-25520

cve-icon Vulnrichment

Updated: 2026-02-06T20:17:55.302Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-02-06T20:16:10.440

Modified: 2026-02-06T21:57:22.450

Link: CVE-2026-25520

cve-icon Redhat

No data.