CVE-2026-42085

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 following products are affected by CVE-2026-42085 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-42085.

URL	Resource
https://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5
https://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42
https://github.com/OpenC3/cosmos/releases/tag/v6.10.5
https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3
https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h