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CVE-2026-43898

10.0 · CRITICAL

SandboxJS is a JavaScript sandboxing library.

Published May 28, 2026CWE-94EPSS 0.63%

Overview

CVE-2026-43898 is a critical-severity vulnerability. It was published on May 28, 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 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.

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/826865251232611ec94078bab5a18ec875dad4a5GitHubgithub.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqwGitHubgithub.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43898?

CVE-2026-43898 is a critical-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-43898?

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-2026-43898?

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-2026-43898?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43898 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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