What is CVE-2026-23830?

CVE-2026-23830 is a critical-severity vulnerability in Nyariv Sandboxjs, classified under Code Injection. CVSS score: 10.0/10. Published 2026-01-27.

How severe is CVE-2026-23830?

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

RCE in Nyariv Sandboxjs

CVE-2026-23830

SandboxJS is a JavaScript sandboxing library. Versions prior to 0.8.26 have a sandbox escape vulnerability due to `AsyncFunction` not being isolated in `SandboxFunction`. The library attempts to sandbox code execution by replacing the glob…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.002 (45.8th 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 < 0.8.26

Weakness classification (CWE)

References

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-wxhw-j4hc-fmq6 (x_refsource_CONFIRM)
https://github.com/nyariv/SandboxJS/commit/345aee6566e47979dee5c337b925b141e7f78ccd (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-23830?: CVE-2026-23830 is a critical-severity vulnerability in Nyariv Sandboxjs, classified under Code Injection. CVSS score: 10.0/10. Published 2026-01-27.
How severe is CVE-2026-23830?: Critical severity. CVSS v3 base score is 10.0 out of 10.