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.

• CWE-23

• https://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5Patch
• https://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42Patch
• https://github.com/OpenC3/cosmos/releases/tag/v6.10.5Release Notes
• https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3Release Notes
• https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hExploit, Vendor Advisory
• https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hExploit, Vendor Advisory

Published

May 4, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-4208The extension fails to properly reset the generated MFA code…8.8
• CVE-2026-42080PPTAgent is an agentic framework for reflective PowerPoint g…4.6
• CVE-2026-42081free5GC is an open-source implementation of the 5G core netw…7.1
• CVE-2026-42082free5GC is an open-source implementation of the 5G core netw…5.4
• CVE-2026-42083free5GC is an open-source implementation of the 5G core netw…8.2
• CVE-2026-42084OpenC3 COSMOS provides the functionality needed to send comm…8.1
• CVE-2026-42086OpenC3 COSMOS provides the functionality needed to send comm…4.6
• CVE-2026-42087OpenC3 COSMOS provides the functionality needed to send comm…9.6
• CVE-2026-42088OpenC3 COSMOS provides the functionality needed to send comm…8.1
• CVE-2026-42089Yeoman Environment provides an API to discover, create, and …8.6
• CVE-2026-4209A vulnerability was identified in D-Link DNS-120, DNR-202L, …9.8
• CVE-2026-42090Notesnook is a note-taking app focused on user privacy & eas…9.6