CVE-2026-42087 OpenC3 COSMOS: SQL Injection in QuestDB Time-Series Data Base
An attacker can execute arbitrary SQL commands in the Time-Series Database component, potentially reading or deleting data.
- 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-2026-42087?
CVE-2026-42087 is a critical SQL injection vulnerability in OpenC3 cosmos, published on 4 May 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 version 6.7.0 to before version 7.0.0-rc3, a SQL injection vulnerability exists in the Time-Series Database (TSDB) component of COSMOS. The tsdb_lookup function in the cvt_model.rb file directly places user-supplied input into a SQL query without sanitizing the input. As a result, a user can break out of the initial SQL statement and execute arbitrary SQL commands, including deleting data. This issue has been patched in version 7.0.0-rc3.
Weakness: CWE-89
Which versions are affected by CVE-2026-42087?
3 open source packages ship an affected version, including openc3. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
openc3 PyPI | From 6.7.0 | 7.0.0 |
openc3 RubyGems | From 6.7.0 | 7.0.0-rc3 |
openc3 RubyGems | From 6.7.0 | 7.0.0-rc3 |
Products include Openc3 Cosmos.
How do I fix CVE-2026-42087?
Upgrade openc3 to a fixed version for your release line: 7.0.0 or 7.0.0-rc3.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-42087 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42087 exists.
Other vulnerabilities in OpenC3 cosmos
Sources
Also known as GHSA-v529-vhwc-wfc5, PYSEC-2026-2244.