CVE-2026-44632

CRITICAL 9.1

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

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

Yamcs is a mission control framework. Prior to 5.12.7, a server-side code injection vulnerability existed in the Yamcs algorithm evaluation engine org.yamcs.algorithms.JavaExprAlgorithmExecutionFactory, which dynamically compiled and evaluated user-controlled algorithm text through the Janino compiler without enforcing a secure sandbox, so an authenticated user with the ChangeMissionDatabase privilege could override an existing algorithm's text via the mission database REST API and inject Java code (for example using java.lang.Runtime) to achieve remote code execution on the underlying host operating system. This issue is fixed in versions 5.12.7 and 5.13.0, which disable algorithm editing by default.

CWE	CWE-94
Vendor	yamcs
Product	yamcs
Published	Jul 16, 2026
Last Updated	Jul 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

yamcs / yamcs

< 5.12.7

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/yamcs/yamcs/security/advisories/GHSA-524g-x36v-9wm6 github.com: https://github.com/yamcs/yamcs/commit/3c550348f866af4675d2ba4a51d8d12b7c7c6011 github.com: https://github.com/yamcs/yamcs/commit/4ff8fda642ea8c3309a4d3f379aa77b763148992 github.com: https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7 github.com: https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0