What is CVE-2026-42084?

CVE-2026-42084 is a high-severity vulnerability in Openc3 Cosmos, classified under CWE-620. CVSS score: 8.1/10. Published 2026-05-04.

How severe is CVE-2026-42084?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Openc3 Cosmos

CVE-2026-42084

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, the OpenC3 password change functionality allows a user to change their password…

EPSS: 0.000 (10.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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)

CWE-620

References

https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7 (x_refsource_CONFIRM, Exploit, Vendor Advisory)
https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776 (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-2026-42084?: CVE-2026-42084 is a high-severity vulnerability in Openc3 Cosmos, classified under CWE-620. CVSS score: 8.1/10. Published 2026-05-04.
How severe is CVE-2026-42084?: High severity. CVSS v3 base score is 8.1 out of 10.