Critical 9.1Published Aug 28, 2026

CVE-2026-55511Yamcs: Authenticated RCE via StreamSQL aggregate-compiler column-name injection in Yamcs `executeSql`

Updated under an hour ago (2026-10-19 09:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.1 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-94
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Sep 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

yamcs yamcs yamcs:yamcs (from the name)	before 5.12.8; from 5.13.0, < 5.13.2	CNA record

References

https://github.com/yamcs/yamcs/security/advisories/GHSA-3g44-3m7x-cgg2x-refsource-confirm
https://github.com/yamcs/yamcs/commit/8c1070b12c0a6c003903325cb2a1013347e2dbdex-refsource-misc
https://github.com/yamcs/yamcs/commit/b65a3d78178ba99a58b753feda6ecc3b5a694f13x-refsource-misc
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8x-refsource-misc
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.