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 vulnerability is fixed in 0.8.27.

Vulnerability class: RCE (Remote Code Execution)

Published 2026-02-02 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.011 (65.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

Nyariv Sandboxjs — versions < 0.8.27

Weakness classification (CWE)

References

github.com/nyariv/SandboxJS/security/advisories/GHSA-9p4w-fq8m-2hp7 (Exploit, Vendor Advisory)
github.com/nyariv/SandboxJS/commit/75c8009db32e6829b0ad92ca13bf458178442bd3 (Patch)
github.com/nyariv/SandboxJS/blob/f212a38fb5a6d4bc2bc2e2466c0c011ce8d41072/src/e… (Product)

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.