[ CVE-2026-77601 · Published 23 Sep 2026 ]
OpenC3 COSMOS: Authenticated OS command injection via the `pypi_url` setting
[ Why it matters ]Priority signals
- Public proof-of-concept exploit exists (CISA SSVC)
[ Description ]Official description
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.
[ Fixes ]Fixes and patches
- openc3 7.3.0Fixed version · GitHub Advisories · rubygems package openc3: upgrade to 7.3.0 or later (affected >= 5.12.0, <= 7.2.1)
[ Packages ]Affected open-source packages
- openc3 rubygemsAffected >= 5.12.0, <= 7.2.1 · fixed in 7.3.0 · GHSA-vp3w-52v9-q57f