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CVE-2026-25587

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Date: February 6, 2026

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.

Severity Score

Related Resources (5)

https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3
https://github.com/nyariv/SandboxJS
https://nvd.nist.gov/vuln/detail/CVE-2026-25587
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xp
https://www.mend.io/vulnerability-database/CVE-2026-25587

Severity Score

Weakness Type (CWE)

Improper Control of Generation of Code ('Code Injection')

CWE-94

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CWE-74

Top Fix

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Upgrade Version

Upgrade to version @nyariv/sandboxjs - 0.8.29

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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