CVE-2026-42085

OpenC3 COSMOS has a path-traversal weakness in save_tool_config() that enables arbitrary file writes into the shared /plugins directory prior to versions 6.10.5 and 7.0.0-rc3. By canonicalizing filenames to absolute paths, a crafted config filename can overwrite existing configuration files acros...

CVE-2026-42085 OpenC3 COSMOS: Arbitrary write to plugins directory via path-traversed config filenames

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 savetoolconfig function that allows saving tool configuration files at arbitrary locations...