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CVE-2026-46562

9.8 · CRITICAL

Yamcs is a mission control framework.

Published Jul 16, 2026CWE-94EPSS 0.98%

Overview

CVE-2026-46562 is a critical-severity vulnerability. It was published on July 16, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Yamcs is a mission control framework. Prior to 5.12.7, the Nashorn ScriptEngine used to evaluate user-supplied JavaScript algorithm text in yamcs-core/src/main/java/org/yamcs/algorithms/ScriptAlgorithmExecutorFactory.java was constructed without a ClassFilter, so a user with the ChangeMissionDatabase privilege could override an algorithm through the MdbOverrideApi.updateAlgorithm endpoint and supply JavaScript that reaches arbitrary Java classes (for example Java.type("java.lang.Runtime").getRuntime().exec(...)) to execute arbitrary OS commands as the Yamcs process; in the default configuration with no security.yaml the built-in guest user has superuser=true, making the issue reachable without authentication. This issue is fixed in versions 5.12.7 and 5.13.0, which disable algorithm editing by default.

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/yamcs/yamcs/commit/3c550348f866af4675d2ba4a51d8d12b7c7c6011GitHubgithub.com/yamcs/yamcs/commit/4ff8fda642ea8c3309a4d3f379aa77b763148992GitHubgithub.com/yamcs/yamcs/releases/tag/yamcs-5.12.7GitHubgithub.com/yamcs/yamcs/releases/tag/yamcs-5.13.0GitHubgithub.com/yamcs/yamcs/security/advisories/GHSA-vmwp-vh32-rj75GitHubgithub.com/yamcs/yamcs/security/advisories/GHSA-vmwp-vh32-rj75

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46562?

CVE-2026-46562 is a critical-severity vulnerability. It was published on July 16, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-46562?

This vulnerability has a CVSS 3.1 base score of 9.8, 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-2026-46562?

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-2026-46562?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46562 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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