What is CVE-2026-25142?

CVE-2026-25142 is a critical-severity vulnerability in Nyariv Sandboxjs, classified under Code Injection. CVSS score: 10.0/10. Published 2026-02-02.

How severe is CVE-2026-25142?

Critical severity. CVSS v3 base score is 10.0 out of 10.

RCE in Nyariv Sandboxjs

CVE-2026-25142

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 vulnerabil…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (49.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Nyariv Sandboxjs — versions < 0.8.27

Weakness classification (CWE)

CWE-94 — Code Injection

References

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-9p4w-fq8m-2hp7 (x_refsource_CONFIRM)
https://github.com/nyariv/SandboxJS/commit/75c8009db32e6829b0ad92ca13bf458178442bd3 (x_refsource_MISC)
https://github.com/nyariv/SandboxJS/blob/f212a38fb5a6d4bc2bc2e2466c0c011ce8d41072/src/executor.ts#L368-L398 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-25142?: CVE-2026-25142 is a critical-severity vulnerability in Nyariv Sandboxjs, classified under Code Injection. CVSS score: 10.0/10. Published 2026-02-02.
How severe is CVE-2026-25142?: Critical severity. CVSS v3 base score is 10.0 out of 10.