CVE-2026-42085
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
openc3RubyGems | < 6.10.5 | 6.10.5 |
openc3RubyGems | >= 7.0.0.pre.rc1, < 7.0.0-rc3 | 7.0.0-rc3 |
Affected products
4Patches
Vulnerability mechanics
References
8- github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5nvdPatchWEB
- github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42nvdPatchWEB
- github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hnvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-4jvx-93h3-f45hghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-42085ghsaADVISORY
- github.com/OpenC3/cosmos/releases/tag/v6.10.5nvdRelease NotesWEB
- github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3nvdRelease NotesWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/openc3/CVE-2026-42085.ymlghsaWEB
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