What is CVE-2026-42088?

CVE-2026-42088 is a critical-severity vulnerability in Openc3 Cosmos, classified under CWE-250. CVSS score: 9.6/10. Published 2026-05-04.

How severe is CVE-2026-42088?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Vulnerability in Openc3 Cosmos

CVE-2026-42088

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to version 7.0.0-rc3, the Script Runner widget allows users to execute Python and Ruby scripts directly from the…

EPSS: 0.000 (8.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

Affected products

Openc3 Cosmos — versions 7.0.0, < 7.0.0-rc3

Weakness classification (CWE)

CWE-250

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-42088?: CVE-2026-42088 is a critical-severity vulnerability in Openc3 Cosmos, classified under CWE-250. CVSS score: 9.6/10. Published 2026-05-04.
How severe is CVE-2026-42088?: Critical severity. CVSS v3 base score is 9.6 out of 10.