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CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-42085
Vulnerability Information

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Vulnerability Title
OpenC3 COSMOS: Arbitrary write to plugins directory via path-traversed config filenames
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
相对路径遍历
Source: NVD (National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
OpenC3cosmos < 6.10.5 -
II. Public POCs for CVE-2026-42085
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III. Intelligence Information for CVE-2026-42085
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IV. Related Vulnerabilities
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