CVE-2026-25587 | SandboxJS is a JavaScript sandboxing library. Prior to 0.8.2… | CVSS 10.0 CRITICAL

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.

Metadata

CVE ID: CVE-2026-25587
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-02-03 01:02 UTC
Published: 2026-02-06 19:51 UTC
Last updated: 2026-02-06 20:19 UTC
Primary CWE: CWE-94
CWE-94: Improper Control of Generation of Code ('Code Inject…
Vendor / Product: nyariv / SandboxJS
Sources: cve.org · NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
nyariv	SandboxJS	—	< 0.8.29

Weakness (CWE)

CWE	Source	Description
CWE-94	cna	CWE-94: Improper Control of Generation of Code ('Code Injection')

CVSS scores (1)

Score	Severity	Version	Source	Vector
10.0	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References (2)

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xp https://github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xp
https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3 https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3