CVE-2026-42085

4.3 MEDIUM
Published: May 04, 2026 Modified: May 08, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/OpenC3/cosmos/releases/tag/v6.10.5
Source: security-advisories@github.com
Release Notes
https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3
Source: security-advisories@github.com
Release Notes
https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h
Source: security-advisories@github.com
Exploit Vendor Advisory
https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Vendor Advisory

6 reference(s) from NVD

Quick Stats

CVSS v3 Score
4.3 / 10.0
EPSS (Exploit Probability)
0.3%
23th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

openc3