What is CVE-2026-34217?

CVE-2026-34217 is a high-severity vulnerability in Nyariv Sandboxjs, classified under Exposure of Resource to Wrong Sphere. CVSS score: 7.2/10. Published 2026-04-06.

How severe is CVE-2026-34217?

High severity. CVSS v3 base score is 7.2 out of 10.

Vulnerability in Nyariv Sandboxjs

CVE-2026-34217

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, a scope modification vulnerability exists in @nyariv/sandboxjs. The vulnerability allows untrusted sandboxed code to leak internal interpreter objects through the new operator…

EPSS: 0.003 (21.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Nyariv Sandboxjs — versions < 0.8.36

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-34217?: CVE-2026-34217 is a high-severity vulnerability in Nyariv Sandboxjs, classified under Exposure of Resource to Wrong Sphere. CVSS score: 7.2/10. Published 2026-04-06.
How severe is CVE-2026-34217?: High severity. CVSS v3 base score is 7.2 out of 10.