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

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Summary

CVECVE-2026-42085
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-04 18:16:30 UTC
Updated2026-05-04 19:16:04 UTC
DescriptionOpenC3 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Problem Types: CWE-23 | CWE-23 CWE-23: Relative Path Traversal

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenC3 Cosmos affected < 6.10.5 Not specified
CNA OpenC3 Cosmos affected >= 7.0.0.pre.rc1, < 7.0.0-rc3 Not specified

References

ReferenceSourceLinkTags
github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42 [email protected] github.com
github.com/OpenC3/cosmos/releases/tag/v6.10.5 [email protected] github.com
github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5 [email protected] github.com
github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3 [email protected] github.com
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