CVE-2026-55511
CriticalCVSS 9.1Summary
Yamcs before versions 5.12.8 and 5.13.2 allows a user with SystemPrivilege.ControlArchiving to create a double-quoted StreamSQL column name that is interpolated into generated Java source. Via the POST /api/archive/{instance}:executeSql endpoint, arbitrary Java code can be executed in the Yamcs server process, potentially exposing mission data and credentials and permitting telemetry tampering or denial of service. This issue is fixed in versions 5.12.8 and 5.13.2.
Risk Assessment
An attacker can gain full control of the Yamcs server, leading to confidentiality breaches of mission data, credential theft, telemetry manipulation, and service disruption.
Recommendation
Immediately upgrade Yamcs to version 5.12.8 or 5.13.2 and restrict access to the executeSql endpoint to trusted users only.
Original NVD description (English source)
Yamcs is a mission control framework. Prior to 5.12.8 and 5.13.2, Yamcs allows a user with SystemPrivilege.ControlArchiving to create a double-quoted StreamSQL column name that is interpolated into generated Java source by Expression.fillCode_InputDefVars and Expression.sanitizeName. A sum aggregate reaches yamcs-core/src/main/java/org/yamcs/yarch/streamsql/CompilableAggregateExpression.java and yamcs-core/src/main/java/org/yamcs/yarch/streamsql/funct/SumExpression.java through SelectExpression.compile, where Janino SimpleCompiler.cook compiles the injected source. POST /api/archive/{instance}:executeSql can therefore execute arbitrary Java in the Yamcs server process, exposing mission data and credentials and permitting telemetry tampering or denial of service. This issue is fixed in versions 5.12.8 and 5.13.2.