Vulnerability details

CVE-2026-46621

yamcs yamcs

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

CVSS 3.1

9.1Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.1Critical	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
yamcs	yamcs	< 5.12.7	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/yamcs/yamcs/commit/3c550348f866af4675d2ba4a51d8d12b7c7c6011 x_refsource_MISC
https://github.com/yamcs/yamcs/commit/4ff8fda642ea8c3309a4d3f379aa77b763148992 x_refsource_MISC
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7 x_refsource_MISC
https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0 x_refsource_MISC
https://github.com/yamcs/yamcs/security/advisories/GHSA-2g95-6x5q-xjwj x_refsource_CONFIRM

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Details

Published: 2026-07-16
Last updated: 2026-07-16
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

1.11%

Probability of exploitation in 30 days

66.2%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Total

Weaknesses (CWE)

CWE-94
Improper Control of Generation of Code ('Code Injection')