CVE-2026-25587 CRITICAL

CVE-2026-25587: SandboxJS has a Sandbox Escape

Vendor Nyariv
Product SandboxJS
Weakness CWE-94 · Code injection
Published February 6, 2026
Last update February 6, 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 0.8.29, as Map is in SAFE_PROTOYPES, it's prototype can be obtained via Map.prototype. By overwriting Map.prototype.has the sandbox can be escaped. This vulnerability is fixed in 0.8.29.

Key dates

02Disclosure timeline

February 6, 2026 CVE published
February 6, 2026 Record updated