CVE-2026-25881
9.0 · CRITICALOverview
CVE-2026-25881 is a critical-severity vulnerability affecting nyariv sandboxjs. It was published on February 9, 2026 and has a CVSS 3.1 base score of 9.0 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed code to mutate host built-in prototypes by laundering the isGlobal protection flag through array literal intermediaries. When a global prototype reference (e.g., Map.prototype, Set.prototype) is placed into an array and retrieved, the isGlobal taint is stripped, permitting direct prototype mutation from within the sandbox. This results in persistent host-side prototype pollution and may enable RCE in applications that use polluted properties in sensitive sinks (example gadget: execSync(obj.cmd)). This vulnerability is fixed in 0.8.31.
Remediation
Check the references section for vendor advisories and patches from nyariv. Update sandboxjs to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| nyariv | sandboxjs | >= 0, < 0.8.31 | Affected |
Frequently Asked Questions
What is CVE-2026-25881?
CVE-2026-25881 is a critical-severity vulnerability affecting nyariv sandboxjs. It was published on February 9, 2026 and has a CVSS 3.1 base score of 9.0 (CRITICAL).
How severe is CVE-2026-25881?
This vulnerability has a CVSS 3.1 base score of 9.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-25881?
Check the references section for vendor advisories and patches from nyariv. Update sandboxjs to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-25881?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-25881 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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