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CVE-2026-42085

4.3 · MEDIUM

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems.

Published May 4, 2026CWE-23EPSS 0.41%

Overview

CVE-2026-42085 is a medium-severity vulnerability. It was published on May 4, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to versions 6.10.5 and 7.0.0-rc3, OpenC3 COSMOS contains a design flaw in the save_tool_config() function that allows saving tool configuration files at arbitrary locations inside the shared /plugins directory tree by supplying crafted configuration filenames. Although the implementation sufficiently mitigates standard path traversal attacks, by canonicalizing filename to an absolute path, all plugins share this same root directory. That enables users to create arbitrary file structures and overwrite existing configuration files within the shared /plugins directory. This issue has been patched in versions 6.10.5 and 7.0.0-rc3.

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/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5GitHubgithub.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42GitHubgithub.com/OpenC3/cosmos/releases/tag/v6.10.5GitHubgithub.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3GitHubgithub.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hGitHubgithub.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42085?

CVE-2026-42085 is a medium-severity vulnerability. It was published on May 4, 2026 and has a CVSS 3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-42085?

This vulnerability has a CVSS 3.1 base score of 4.3, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-42085?

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-2026-42085?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42085 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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