CVE-2026-25586

CRITICAL
2026-02-06 [email protected] GHSA-jjpw-65fv-8g48
10.0
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Feb 18, 2026 - 14:32 vuln.today
Public exploit code
Patch Released
Feb 18, 2026 - 14:32 nvd
Patch available
CVE Published
Feb 06, 2026 - 20:16 nvd
CRITICAL 10.0

Tags

Information Disclosure Sandboxjs

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.

Analysis

SandboxJS has a third CVSS 10.0 sandbox escape via Map prototype shadowing that allows complete sandbox bypass.

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Remediation

Within 24 hours: Identify all instances of SandboxJS in use across the organization and their version numbers; communicate findings to development and operations teams. Within 7 days: Upgrade all affected SandboxJS installations to version 0.8.29 or later; test upgraded environments in staging to confirm functionality. …

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Priority Score

70
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +50
POC: +20

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CVE-2026-25586 vulnerability details – vuln.today
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