CVE-2026-77601 OpenC3 COSMOS: Authenticated OS command injection via the `pypi_url` setting
Authenticated attackers can inject OS commands via the pypi_url setting during plugin installation, executing arbitrary code as the service user.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-77601?
CVE-2026-77601 is a high-severity command injection vulnerability in OpenC3 cosmos, published on 23 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-77601?
2 open source packages ship an affected version, including openc3.
| Package | Affected | Fixed in |
|---|---|---|
openc3 RubyGems | From 5.12.0 | 7.3.0 |
openc3 RubyGems | From 5.12.0 | 7.3.0 |
How do I fix CVE-2026-77601?
Upgrade openc3 to 7.3.0 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-77601 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77601 exists.
Sources
Also known as GHSA-vp3w-52v9-q57f.