OpenC3 COSMOS: Authenticated OS command injection via the `pypi_url` setting (CVE-2026-77601) | HOL Guard CVE

High · CVSS 8.8CVE-2026-77601GHSA-VP3W-52V9-Q57F

OpenC3 COSMOS: Authenticated OS command injection via the `pypi_url` setting

Answer in brief

CVE-2026-77601 records a High severity (CVSS 8.8) vulnerability in OpenC3 COSMOS: Authenticated OS command injection via the `pypi_url` setting. The current sources do not mark it as known exploited. The current feed maps OpenC3/cosmos (generic), openc3 (rubygems). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 23, 2026Updated Sep 23, 2026Source checked Sep 23, 2026First seen by HOL Sep 23, 2026Material review Sep 23, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps OpenC3/cosmos (generic), openc3 (rubygems). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
OpenC3/cosmosgeneric	>=5.12.0 <7.3.0	7.3.0
openc3rubygems	>=5.12.0,<=7.2.1	7.3.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for OpenC3/cosmos, openc3.
Review the reported fix. Update OpenC3/cosmos to 7.3.0; openc3 to 7.3.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 23, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.