OpenC3 cosmos up to 6.10.4/7.0.0-rc2 Configuration File /plugins save_tool_config path traversal

Summaryinfo

A vulnerability was found in OpenC3 cosmos up to 6.10.4/7.0.0-rc2 and classified as problematic. This affects the function save_tool_config of the file /plugins of the component Configuration File Handler. The manipulation results in path traversal. This vulnerability is known as CVE-2026-42085. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenC3 cosmos up to 6.10.4/7.0.0-rc2. It has been classified as problematic. Affected is the function save_tool_config of the file /plugins of the component Configuration File Handler. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-23. The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory. This is going to have an impact on integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-42085 since 04/23/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 6.10.5 or 7.0.0-rc3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• OpenC3

Name

• cosmos

Version

• 6.10.0
• 6.10.1
• 6.10.2
• 6.10.3
• 6.10.4
• 7.0.0-rc1
• 7.0.0-rc2

License

• open-source

Website

• Product: https://github.com/OpenC3/cosmos/

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