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Advisory record · GHSA-3g44-3m7x-cgg2

Yamcs vulnerable to authenticated RCE via StreamSQL aggregate-compiler column-name injection in Yamcs `executeSql`

CVSS 9.1 CriticalCriticalEPSS 0.0068 · 52nd percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 28 Aug 2026, 17:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.yamcs:yamcs-coreMaven>=5.13.0, <5.13.2 || <5.12.85.13.2, 5.12.8
Identifiers
GHSA-3g44-3m7x-cgg2 · CVE-2026-55511
Weakness (CWE)
CWE-94
Tags
Published
28 Aug 2026
Updated
28 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Yamcs versions from 5.13.0 before 5.13.2 and from 5.12.0 before 5.12.8 are affected (the advisory lists the fixed versions as 5.13.2 and 5.12.8). An authenticated user holding the ControlArchiving system privilege can submit a crafted column name in a StreamSQL aggregate, which the aggregate compiler inserts unescaped into generated Java source. This allows arbitrary code execution inside the Yamcs server process. Upgrade yamcs-core to 5.13.2 or 5.12.8, or later in the same release line.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0068, the 52nd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:19 UTC First seen by agentprime
  2. 31 Oct 2026, 14:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.