SEPTEMBER 15, 2026
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Case File

CVE-2026-55511

CRITICAL · CVSS 9.1 EPSS 0.68% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-28 · Last synced 2026-09-15

CyberRota Analysis

AI-Generated

Yamcs versions prior to 5.12.8 and 5.13.2 are vulnerable to a critical security flaw that allows users with SystemPrivilege.ControlArchiving to execute arbitrary Java code through crafted StreamSQL column names. This vulnerability can lead to exposure of sensitive mission data, unauthorized telemetry manipulation, and potential denial of service. Organizations utilizing Yamcs for mission control should prioritize upgrading to the patched versions to mitigate these risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-55511
Severity
CRITICAL
CVSS
9.1
EPSS
0.68%
Java

Original NVD Description

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.