What is the CVSS score of CVE-2026-25142?

CVE-2026-25142 has a CVSS 3.1 base score of 10.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Which versions of Sandboxjs are affected by CVE-2026-25142?

SandboxJS versions prior to 0.8.27 contain a critical vulnerability (CVSS 10.0) that allows attackers to escape the sandbox and execute arbitrary code remotely.. A patch is available.

Is there a public PoC exploit available for CVE-2026-25142?

Yes, a public proof-of-concept exploit is available for CVE-2026-25142. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2026-25142?

Within 24 hours: Identify all systems and applications using SandboxJS and their version numbers; isolate affected systems from production if they process untrusted code. Within 7 days: Upgrade SandboxJS to version 0.8.27 or later across all affected applications and conduct testing in staging environments. Within 30 days: Complete deployment to all production systems, verify patch application through vulnerability scanning, and document remediation in change management.

Sandboxjs CVE-2026-25142

CRITICAL

Code Injection (CWE-94)

2026-02-02 security-advisories@github.com

GHSA-9p4w-fq8m-2hp7

RCE Sandboxjs

10.0

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

10.0 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Analysis Generated

Mar 12, 2026 - 22:01 vuln.today

PoC Detected

Feb 18, 2026 - 14:34 vuln.today

Public exploit code

Patch released

Feb 18, 2026 - 14:34 nvd

Patch available

CVE Published

Feb 02, 2026 - 23:16 nvd

CRITICAL 10.0

DescriptionGitHub Advisory

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.27, SanboxJS does not properly restrict __lookupGetter__ which can be used to obtain prototypes, which can be used for escaping the sandbox / remote code execution. This vulnerability is fixed in 0.8.27.