Vulnerability in Nyariv Sandboxjs
CVE-2026-25641
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, there is a sandbox escape vulnerability due to a mismatch between the key on which the validation is performed and the key used for accessing properties. Even though the key us…
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
EPSS: 0.005 (38.9th 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 < 0.8.29
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-25641?
- CVE-2026-25641 is a critical-severity vulnerability in Nyariv Sandboxjs, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 10.0/10. Published 2026-02-06.
- How severe is CVE-2026-25641?
- Critical severity. CVSS v3 base score is 10.0 out of 10.