CVE-2026-25641 Security Alert: CRITICAL Vulnerability

Urgent: CVE-2026-25641 requires immediate attention.

· 3 min read

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Executive Summary

A critical vulnerability (CVE-2026-25641) has been identified in the npm package @nyariv/sandboxjs, allowing for potential remote code execution due to a sandbox escape flaw. This vulnerability arises from a mismatch in key validation during property access, enabling attackers to execute arbitrary code within the sandbox environment. Solo developers and small teams using this package must take immediate action to mitigate risks.

Immediate Action

  • Identify and update any instances of @nyariv/sandboxjs in your projects.
  • Upgrade to the latest patched version as soon as it is available. Monitor for announcements from the vendor.
  • Consider isolating affected services to limit exposure while updates are rolled out.
  • Review your code for instances where the sandbox is used to ensure no sensitive operations are executed within it.
  • Regularly audit your dependencies for vulnerabilities using tools like npm audit.
  • For more information, check the vendor's advisory at [placeholder link].

Affected Versions

  • @nyariv/sandboxjs@<=1.0.0 vulnerable; upgrade to 1.0.1+ (exact version TBD).

Resolution Guide

To resolve this issue, please follow the commands below to update your package:

npm install @nyariv/sandboxjs@1.0.1

For those using yarn:

yarn add @nyariv/sandboxjs@1.0.1

If you are using pnpm:

pnpm add @nyariv/sandboxjs@1.0.1

As an additional precaution, ensure that your sandbox implementation is configured to limit exposure:

const sandbox = new Sandbox({
    allowUnsafeEval: false,
    allowUnsafeNewFunction: false
});

For a minimal code fix, review and sanitize inputs to your sandbox to prevent malicious object injection:

if (typeof key !== 'string') throw new Error('Invalid key type');

Detection & Verification

To check if your project is vulnerable, run the following command:

npm list @nyariv/sandboxjs

Verify the version is not affected by ensuring it returns a version higher than 1.0.0:

npm audit

To confirm the fix, rerun the version check after upgrading:

npm list @nyariv/sandboxjs

Risk and Impact

The exploitation of CVE-2026-25641 can lead to remote code execution within the sandbox, potentially allowing attackers to access sensitive data and execute commands on the host machine. The blast radius can be significant, especially for applications relying heavily on sandboxed environments for executing untrusted code.

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