CVE-2026-42088 — CRITICAL (9.6)

Q: How severe is CVE-2026-42088?

CVE-2026-42088 has been rated CRITICAL with a CVSS base score of 9.6/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-42088?

Check the references section above for vendor advisories and patch information. Affected products include: Openc3 Cosmos.

Vulnerability Description

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 openc3-COSMOS-script-runner-api container. Because all the docker containers share a network, users can execute specially crafted scripts to bypass the API permissions check and perform administrative actions, including reading and modifying data inside the Redis database, which can be used to read secrets and change COSMOS settings, as well as read and write to the buckets service, which holds configuration, log, and plugin files. These actions are normally only available from the Admin Console or with administrative privileges. Any user with permission to create and run scripts can connect to any service in the docker network. This issue has been patched in version 7.0.0-rc3.

CVSS Score

9.6

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Openc3	Cosmos	< 7.0.0

Related Weaknesses (CWE)

CWE-250

References

https://github.com/OpenC3/cosmos/releases/tag/v7.0.0Release Notes
https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3Release Notes
https://github.com/OpenC3/cosmos/security/advisories/GHSA-2wvh-87g2-89hrExploitVendor Advisory
https://github.com/OpenC3/cosmos/security/advisories/GHSA-2wvh-87g2-89hrExploitVendor Advisory

FAQ

What is CVE-2026-42088?

CVE-2026-42088 is a vulnerability with a CVSS score of 9.6 (CRITICAL). 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 Pyt...

How severe is CVE-2026-42088?

CVE-2026-42088 has been rated CRITICAL with a CVSS base score of 9.6/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-42088?

Check the references section above for vendor advisories and patch information. Affected products include: Openc3 Cosmos.