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CRITICAL

Unauthenticated Remote Code Execution in openc3-api

Published Jan 13, 2026

Description

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.0.0 to 6.10.1, OpenC3 COSMOS contains a critical remote code execution vulnerability reachable through the JSON-RPC API. When a JSON-RPC request uses the string form of certain APIs, attacker-controlled parameter text is parsed into values using String#convert_to_value. For array-like inputs, convert_to_value executes eval(). Because the cmd code path parses the command string before calling authorize(), an unauthenticated attacker can trigger Ruby code execution even though the request ultimately fails authorization (401). This vulnerability is fixed in 6.10.2.

Affected products

Remediation

No remediation recorded yet.

Weaknesses (1)

References (6)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner GitHub_M
Published Jan 13, 2026
Updated Jan 13, 2026
Reserved Dec 16, 2025
CISA Vulnrichment
Updated Jan 13, 2026
NVD
Status Deferred
Modified Jun 17, 2026
Red Hat
Severity n/a
Public date n/a
ENISA EUVD
Assigner GitHub_M
Published Jan 13, 2026
Updated Jan 13, 2026
Exploited since n/a
EUVD-2026-2030 GHSA-W757-4QV9-MGHP