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.
Configurations

Configuration 1 (hide)

OR 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:*:*:*

History

08 May 2026, 19:54

Type Values Removed Values Added
First Time Openc3 cosmos
Openc3
CPE cpe:2.3:a:openc3:cosmos:7.0.0:rc2:*:*:open_source:*:*:*
cpe:2.3:a:openc3:cosmos:*:*:*:*:open_source:*:*:*
cpe:2.3:a:openc3:cosmos:7.0.0:rc1:*:*:open_source:*:*:*
References () https://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5 - () https://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5 - Patch
References () https://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42 - () https://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42 - Patch
References () https://github.com/OpenC3/cosmos/releases/tag/v6.10.5 - () https://github.com/OpenC3/cosmos/releases/tag/v6.10.5 - Release Notes
References () https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3 - () https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3 - Release Notes
References () https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h - () https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h - Exploit, Vendor Advisory

04 May 2026, 19:16

Type Values Removed Values Added
References () https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h - () https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h -

04 May 2026, 18:16

Type Values Removed Values Added
New CVE

Information

Published : 2026-05-04 18:16

Updated : 2026-05-08 19:54


NVD link : CVE-2026-42085

Mitre link : CVE-2026-42085

CVE.ORG link : CVE-2026-42085


JSON object : View

Products Affected

openc3

  • cosmos
CWE
CWE-23

Relative Path Traversal