GHSA-524g-x36v-9wm6: org.yamcs:yamcs-core (CVE-2026-44632)

Yamcs Vulnerable to Server-Side Code Injection (RCE) via Janino Expression Engine in `JavaExprAlgorithmExecutionFactory`

CVSS 9.1 CriticalCriticalEPSS 0.011 · 66th percentile

Critical, because:

CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 27 May 2026, 00:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
org.yamcs:yamcs-core	Maven	<5.12.7	5.12.7

Identifiers

GHSA-524g-x36v-9wm6 · CVE-2026-44632

Weakness (CWE)

CWE-94

Machine-written summary

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

Yamcs (org.yamcs:yamcs-core) versions before 5.12.7 are vulnerable to server-side code injection through the algorithm evaluation engine, which compiles user-supplied algorithm text with the Janino compiler without a sandbox. An authenticated user holding the ChangeMissionDatabase privilege can inject Java code that runs operating system commands on the host. Upgrade to version 5.12.7 or later.

Written 3 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

Score	Rating	CVSS	Vector	Source
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 0.011, the 66th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:20 UTC First seen by agentprime
31 Oct 2026, 14:20 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.