Yamcs up to 5.12.7/5.13.1 aggregate-compiler executeSql column-name injection

Summaryinfo

A vulnerability, which was classified as very critical, was found in Yamcs up to 5.12.7/5.13.1. The affected element is the function executeSql of the component aggregate-compiler. Such manipulation of the argument column-name leads to injection. This vulnerability is documented as CVE-2026-55511. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Yamcs up to 5.12.7/5.13.1. Affected by this issue is the function executeSql of the component aggregate-compiler. The manipulation of the argument column-name with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-55511 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/28/2026). The MITRE ATT&CK project declares the attack technique as T1055.

Upgrading to version 5.12.8 or 5.13.2 eliminates this vulnerability.

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Productinfo

Name

• Yamcs

Version

• 5.12.0
• 5.12.1
• 5.12.2
• 5.12.3
• 5.12.4
• 5.12.5
• 5.12.6
• 5.12.7
• 5.13.0
• 5.13.1

Website

• Product: https://github.com/yamcs/yamcs/

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