OpenC3 COSMOS up to 7.2.x Plugin Installation plugin_model.rb PluginModel.install_phase2 pypi_url os command injection

Summaryinfo

A vulnerability described as critical has been identified in OpenC3 COSMOS up to 7.2.x. This affects the function OpenC3::PluginModel.install_phase2 of the file openc3/lib/openc3/models/plugin_model.rb of the component Plugin Installation. Executing a manipulation of the argument pypi_url can lead to os command injection. This vulnerability is registered as CVE-2026-77601. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in OpenC3 COSMOS up to 7.2.x. It has been declared as critical. This vulnerability affects the function OpenC3::PluginModel.install_phase2 of the file openc3/lib/openc3/models/plugin_model.rb of the component Plugin Installation. The manipulation of the argument pypi_url with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.12.0 until 7.3.0, an authenticated actor can write the pypi_url setting through set_setting at POST /openc3-api/api, then cause OpenC3::PluginModel.install_phase2 in openc3/lib/openc3/models/plugin_model.rb to interpolate the value into a shell command while installing a plugin with Python dependency metadata. Shell metacharacters in the setting are interpreted by the command shell, allowing arbitrary operating-system commands to run as the openc3 service user with access to Redis and bucket credentials. Open-source deployments permit any authenticated user to reach the affected operations, while Enterprise deployments require an administrator. This issue is fixed in version 7.3.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-77601 since 08/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

Upgrading to version 7.3.0 eliminates this vulnerability.

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Productinfo

Vendor

• OpenC3

Name

• COSMOS

Version

• 7.0
• 7.1
• 7.2

Website

• Product: https://github.com/OpenC3/cosmos/

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