---
id: CVE-2026-55511
title: Yamcs is a mission control framework
summary: >-
  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.fil…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-94
vendor: yamcs
product: 'org.yamcs:yamcs-core'
affected:
  - 'org.yamcs:yamcs-core >= 5.13.0, <= 5.13.1'
  - 'org.yamcs:yamcs-core <= 5.12.7'
patched:
  - 'org.yamcs:yamcs-core 5.13.2'
  - 'org.yamcs:yamcs-core 5.12.8'
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:08:37.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55511'
references:
  - url: >-
      https://github.com/yamcs/yamcs/commit/8c1070b12c0a6c003903325cb2a1013347e2dbde
    label: security-advisories@github.com
  - url: >-
      https://github.com/yamcs/yamcs/commit/b65a3d78178ba99a58b753feda6ecc3b5a694f13
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/security/advisories/GHSA-3g44-3m7x-cgg2'
    label: security-advisories@github.com
  - url: 'https://github.com/yamcs/yamcs/security/advisories/GHSA-3g44-3m7x-cgg2'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-3g44-3m7x-cgg2'
tags:
  - nvd
  - exploit-available
  - ghsa
  - maven
epss: 0.00677
epssPercentile: 0.50212
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/junfuture1103/CVE-2026-55511'
  checkedAt: '2026-09-26T09:05:50.240Z'
exploitAvailable: true
aliases:
  - GHSA-3g44-3m7x-cgg2
ecosystem: maven
ingestedAt: '2026-08-28T17:22:56.322Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55511)

Affected packages:

- `org.yamcs:yamcs-core >= 5.13.0, <= 5.13.1`
- `org.yamcs:yamcs-core <= 5.12.7`

Patched in:

- `org.yamcs:yamcs-core 5.13.2`
- `org.yamcs:yamcs-core 5.12.8`

Source: https://github.com/advisories/GHSA-3g44-3m7x-cgg2