CVE-2026-26954 Security Alert: CRITICAL Vulnerability

Urgent: CVE-2026-26954 requires immediate attention.

· 3 min read

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Executive Summary

A critical vulnerability, CVE-2026-26954, has been identified in the npm package @nyariv/sandboxjs. This flaw allows attackers to escape the sandbox environment by obtaining arrays containing Function objects, leading to potential remote code execution (RCE). With a CVSS score of 10, this vulnerability poses a severe risk, particularly for solo developers and small teams relying on this package for sandboxing functionality.

Immediate Action

  • Immediately review your project dependencies for @nyariv/sandboxjs.
  • If using vulnerable versions, upgrade to the patched version as soon as it is available.
  • Consider isolating services that utilize this package until a fix is applied.
  • Monitor your applications for suspicious activity as a precaution.
  • Stay tuned for updates from the vendor regarding patch releases. [Placeholder link text]

Affected Versions

  • @nyariv/sandboxjs@<=1.2.3 vulnerable; upgrade to 1.2.4+

Resolution Guide

To mitigate this vulnerability, follow these steps:

npm install @nyariv/sandboxjs@1.2.4

If you are using other package managers, consider these commands:

yarn add @nyariv/sandboxjs@1.2.4
pnpm install @nyariv/sandboxjs@1.2.4

For configuration hardening, consider disabling features that allow dynamic function creation or limiting the scope of your sandbox environment.

Example code fix snippet to avoid using vulnerable features:

const safeSandbox = new s({ allowFunctions: false });

Detection & Verification

To check if your project is vulnerable, run:

npm ls @nyariv/sandboxjs

Verify the fix by ensuring the installed version is secure:

npm ls @nyariv/sandboxjs | grep 1.2.4

Risk and Impact

The exploitation of CVE-2026-26954 can lead to unauthorized access and control over your application, enabling attackers to execute arbitrary commands on your server. The risk is particularly high for applications that process user input or execute untrusted code, potentially impacting data integrity and confidentiality.

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