Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M
CVE-2026-46562Yamcs: Remote Code Execution via Mission Database algorithm override
Critical 9.8
In plain English
A critical-severity code injection in yamcs from yamcs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 62% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Yamcs is a mission control framework. Prior to 5.12.7, the Nashorn ScriptEngine used to evaluate user-supplied JavaScript algorithm text in yamcs-core/src/main/java/org/yamcs/algorithms/ScriptAlgorithmExecutorFactory.java was constructed without a ClassFilter, so a user with the ChangeMissionDatabase privilege could override an algorithm through the MdbOverrideApi.updateAlgorithm endpoint and supply JavaScript that reaches arbitrary Java classes (for example Java.type("java.lang.Runtime").getRuntime().exec(...)) to execute arbitrary OS commands as the Yamcs process; in the default configuration with no security.yaml the built-in guest user has superuser=true, making the issue reachable without authentication. This issue is fixed in versions 5.12.7 and 5.13.0, which disable algorithm editing by default.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.yamcs:yamcs-core | 5.12.7 | GHSA-vmwp-vh32-rj75 |
Affected products (as reported)
Weakness: CWE-94, CWE-95, CWE-470 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/yamcs/yamcs/security/advisories/GHSA-vmwp-vh32-rj75 x_refsource_CONFIRM
- https://github.com/yamcs/yamcs/commit/3c550348f866af4675d2ba4a51d8d12b7c7c6011 x_refsource_MISC
- https://github.com/yamcs/yamcs/commit/4ff8fda642ea8c3309a4d3f379aa77b763148992 x_refsource_MISC
- https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7 x_refsource_MISC
- https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0 x_refsource_MISC