PatchTheCVECVE-2026-42086: OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded
CVE-2026-42086 is a medium-severity flaw (CVSS 4.6) affecting cosmos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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, the Command Sender UI uses an unsafe eval() function on array-like command parameters, which allows a user-supplied payload to execute in the browser when sending a command. This creates a self-XSS risk because an attacker can trigger their own script execution in the victim’s session, if allowed to influ
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.6 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.2% (top 90%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2026-05-04 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-42086?
cosmos: upgrade to 7.0.0. Exact commands for each OS are on this page.
Is CVE-2026-42086 being exploited?
CVE-2026-42086 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-42086 affect?
CVE-2026-42086 affects cosmos. Severity is medium (CVSS 4.6). 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, the Command Sender UI uses an unsafe eval() function on array-like command parameters, which all
How urgent is CVE-2026-42086?
Priority 24/100. Public exploit reference
Related CVEs
- CVE-2026-42087 CRITICAL 9.6 UPGRADE OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded
- CVE-2026-42088 CRITICAL 9.6 UPGRADE OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded
- CVE-2026-42084 HIGH 8.1 UPGRADE OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded
- CVE-2026-42085 MEDIUM 4.3 UPGRADE OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded