Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection (yamcs yamcs)
At a glance
- Source
- NVD
- EPSS
- EPSS 1.12 % · percentile 66 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
Description
Yamcs is a mission control framework. Prior to 5.12.7, the Yamcs script evaluation engine for Python algorithms dynamically compiled and evaluated user-controlled algorithm text using Jython through the JSR-223 ScriptEngine API without enforcing a secure sandbox, so an authenticated user with the ChangeMissionDatabase privilege could override an existing Python algorithm's logic through the mission database REST API and import and execute arbitrary Java classes such as java.lang.Runtime to achieve remote code execution on the underlying host operating system. This issue is fixed in versions 5.12.7 and 5.13.0, which disable algorithm editing by default.
Weaknesses (CWE)
- CWE-94 — Improper Control of Generation of Code
References
- https://github.com/yamcs/yamcs/security/advisories/GHSA-2g95-6x5q-xjwj
- https://github.com/yamcs/yamcs/commit/3c550348f866af4675d2ba4a51d8d12b7c7c6011
- https://github.com/yamcs/yamcs/commit/4ff8fda642ea8c3309a4d3f379aa77b763148992
- https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7
- https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | GitHub_M |
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-2g95-6x5q-xjwj — Yamcs Vulnerable to Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection
European references
- ENISA EUVD · EUVD-2026-44959
- GCVE · GCVE-0-2026-46621
Affected configurations (NVD CPE)
cpe:2.3:a:spaceapplications:yamcs:*:*:*:*:*:*:*:*< 5.12.7
Affected products
| Product | Versions |
|---|---|
| yamcs · yamcs | affected < 5.12.7 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |