CVE-2026-42087
Published: 04 May 2026
Summary
CVE-2026-42087 is a critical-severity SQL Injection (CWE-89) vulnerability in Openc3 Cosmos. Its CVSS base score is 9.6 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 24.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-42087 is a SQL injection vulnerability (CWE-89) in the Time-Series Database (TSDB) component of OpenC3 COSMOS, an open-source platform for sending commands to and receiving data from embedded systems. The flaw affects versions from 6.7.0 up to but not including 7.0.0-rc3 and stems from the tsdb_lookup function in the cvt_model.rb file, which directly incorporates unsanitized user-supplied input into SQL queries. This allows attackers to escape the intended query context and execute arbitrary SQL commands, such as data deletion. The vulnerability carries a CVSS v3.1 base score of 9.6 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N).
An attacker with low privileges, such as an authenticated user, can exploit this over the network with low complexity and no user interaction. Exploitation enables arbitrary SQL execution against the TSDB, resulting in high confidentiality and integrity impacts due to the changed scope. Attackers could extract sensitive time-series data or modify and delete database records, potentially disrupting mission-critical telemetry and command operations in embedded systems environments.
The issue was patched in OpenC3 COSMOS version 7.0.0-rc3. Security practitioners should upgrade to this release or later. Detailed mitigation information, including the fixing commit (9ba60c09c8836a37a2e4ea67ab35fe403e041415), is available in the GitHub security advisory (GHSA-v529-vhwc-wfc5) and release notes for v7.0.0-rc3.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-27063
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
SQL injection in network-reachable TSDB component (AV:N) directly maps to T1190 for initial access/impact via public app exploitation; arbitrary SQL enabling record modification/deletion maps to T1565.001 Stored Data Manipulation.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation of unsanitized user-supplied inputs to the tsdb_lookup function before inclusion in SQL queries, preventing SQL injection exploitation.
Mandates timely identification, reporting, and patching of the specific SQL injection flaw fixed in OpenC3 COSMOS version 7.0.0-rc3.
Limits damage from low-privilege (PR:L) exploitation by enforcing least privilege on access to the vulnerable TSDB component and arbitrary SQL execution scope.