CVE-2026-25587

10.0 CRITICAL

Published: February 06, 2026 Modified: February 18, 2026

Description

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3

Source: security-advisories@github.com

Patch

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xp

Source: security-advisories@github.com

Exploit Vendor Advisory

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xp

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Exploit Vendor Advisory

3 reference(s) from NVD

Quick Stats

CVSS v3 Score

10.0 / 10.0

EPSS (Exploit Probability)

0.0%

6th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-94

Affected Vendors

nyariv

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