---
id: CVE-2026-77602
title: >-
  OpenC3 COSMOS provides the functionality needed to send commands to and
  receive data from one or more embedded systems
summary: >-
  OpenC3 COSMOS provides the functionality needed to send commands to and
  receive data from one or more embedded systems. From 5.1.0 until 7.3.0,
  authenticated non-administrator users can write content under
  targets_modified/ that is later…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: openc3
product: openc3
affected:
  - 'openc3 >= 5.1.0, <= 7.2.1'
patched:
  - openc3 7.3.0
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T19:19:18.683'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77602'
references:
  - url: >-
      https://github.com/OpenC3/cosmos/commit/71943352a28128ef3e7e894319d97a656b5cd4f2
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenC3/cosmos/commit/7a1538a4626f82c0d1540fcaa27ffdcbbd71ff81
    label: security-advisories@github.com
  - url: 'https://github.com/OpenC3/cosmos/pull/3488'
    label: security-advisories@github.com
  - url: 'https://github.com/OpenC3/cosmos/security/advisories/GHSA-jjq7-m736-w977'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-jjq7-m736-w977'
tags:
  - nvd
  - ghsa
  - rubygems
  - cve.org
aliases:
  - GHSA-jjq7-m736-w977
ecosystem: rubygems
ingestedAt: '2026-09-23T19:31:04.468Z'
---

## Overview

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From 5.1.0 until 7.3.0, authenticated non-administrator users can write content under targets_modified/ that is later executed by multiple configuration paths below the intended code-execution privilege tier. Table and command or telemetry definitions are processed through ConfigParser, PacketConfig, GENERIC_READ_CONVERSION, or GENERIC_WRITE_CONVERSION, allowing ERB rendering or Ruby and Python evaluation, while openc3-cosmos-script-runner-api/scripts/run_suite_analysis.rb executes suite procedure files through require. Storage uploads, screen saves, and script creation can place content in the overlay, and triggering table processing, a cmd/tlm reload, or suite analysis executes the content in cmd-tlm-api, decom microservices, or Script Runner with access to internal credentials and data. This issue is fixed in version 7.3.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-77602)

Affected packages:

- `openc3 >= 5.1.0, <= 7.2.1`

Patched in:

- `openc3 7.3.0`

Source: https://github.com/advisories/GHSA-jjq7-m736-w977