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CVE-2026-42085 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h	CISA-ADP	ExploitVendor Advisory
https://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5	[email protected]	Patch
https://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42	[email protected]	Patch
https://github.com/OpenC3/cosmos/releases/tag/v6.10.5	[email protected]	Release Notes
https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3	[email protected]	Release Notes
https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h	[email protected]	ExploitVendor Advisory

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-23	Relative Path Traversal	[email protected]

Affected Products

Product	Versions
openc3 cosmos	< 6.10.5 7.0.0 rc1 7.0.0 rc2
CPE cpe:2.3:a:openc3:cosmos:::::open_source:::* cpe:2.3:a:openc3:cosmos:7.0.0:rc1:::open_source:::* cpe:2.3:a:openc3:cosmos:7.0.0:rc2:::open_source:::* Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
May 8, 2026	Initial Analysis	[email protected]
May 4, 2026	CVE Modified	CISA-ADP
May 4, 2026	New CVE Received	[email protected]