Path Traversal in Openc3 Cosmos
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 al…
EPSS: 0.000 (15.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Openc3 Cosmos — versions < 6.10.5, 7.0.0, >= 7.0.0.pre.rc1, < 7.0.0-rc3
Weakness classification (CWE)
References
- https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- https://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5 (Patch, x_refsource_MISC)
- https://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42 (Patch, x_refsource_MISC)
- https://github.com/OpenC3/cosmos/releases/tag/v6.10.5 (x_refsource_MISC, Release Notes)
- https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3 (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-42085?
- CVE-2026-42085 is a medium-severity vulnerability in Openc3 Cosmos, classified under Relative Path Traversal. CVSS score: 4.3/10. Published 2026-05-04.
- How severe is CVE-2026-42085?
- Medium severity. CVSS v3 base score is 4.3 out of 10.