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Vulnerabilities CVE-2026-46621

CVE-2026-46621

Critical
Open
TLP:CLEAR

Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection

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Description

Yamcs is a mission control framework. Prior to 5.12.7, the Yamcs script evaluation engine for Python algorithms dynamically compiled and evaluated user-controlled algorithm text using Jython through the JSR-223 ScriptEngine API without enforcing a secure sandbox, so an authenticated user with the ChangeMissionDatabase privilege could override an existing Python algorithm's logic through the mission database REST API and import and execute arbitrary Java classes such as 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.

Details

CVSS Score
9.1
EPSS Score
1.00%

59.8th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Confidence
90%
Published
Jul 16, 2026
Last Modified
Jul 16, 2026
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