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CVE-2026-25587

10.0 · CRITICAL

SandboxJS is a JavaScript sandboxing library.

Published Feb 6, 2026CWE-94EPSS 0.73%

Overview

CVE-2026-25587 is a critical-severity vulnerability. It was published on February 6, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, 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 0.8.29, as Map is in SAFE_PROTOYPES, it's prototype can be obtained via Map.prototype. By overwriting Map.prototype.has the sandbox can be escaped. This vulnerability is fixed in 0.8.29.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

GitHubgithub.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3GitHubgithub.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xpGitHubgithub.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xp

How CyberStrike helps

Frequently asked questions

What is CVE-2026-25587?

CVE-2026-25587 is a critical-severity vulnerability. It was published on February 6, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-25587?

This vulnerability has a CVSS 3.1 base score of 10.0, 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-2026-25587?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2026-25587?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-25587 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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