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CVE-2026-46621— Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection

Quick assessment

Affected
yamcs yamcs
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Yamcs yamcs是Yamcs团队的航天器遥测数据处理与监控系统。 Yamcs 5.12.7之前版本存在代码注入漏洞，该漏洞源于脚本评估引擎未强制执行安全沙箱，可能导致经过身份验证的用户通过mission database REST API覆盖现有Python算法逻辑并导入执行任意Java类，从而实现远程代码执行。

CVSS 9.1 · Critical EPSS 1.12% · P65

Affected Version Matrix 1

VendorProduct Version RangeStatus
yamcs yamcs < 5.12.7 affected
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I. Basic Information for CVE-2026-46621

Vulnerability Information
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Vulnerability Title
Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Yamcs 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Yamcs yamcs是Yamcs团队的航天器遥测数据处理与监控系统。 Yamcs 5.12.7之前版本存在代码注入漏洞，该漏洞源于脚本评估引擎未强制执行安全沙箱，可能导致经过身份验证的用户通过mission database REST API覆盖现有Python算法逻辑并导入执行任意Java类，从而实现远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
yamcs yamcs < 5.12.7 -

II. Public POCs for CVE-2026-46621

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5598 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-46621

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Patches & Fixes for CVE-2026-46621 (2)

Vendor Advisories for CVE-2026-46621 (1)

Vendor Pages for CVE-2026-46621 (2)

Same Patch Batch · yamcs · 2026-07-16 · 6 CVEs total

CVE-2026-46562 9.8 CRITICAL Yamcs: Remote Code Execution via Mission Database algorithm override
CVE-2026-44632 9.1 CRITICAL Yamcs: Server-Side Code Injection (RCE) via Janino Expression Engine in `JavaExprAlgorithm
CVE-2026-44596 6.5 MEDIUM Yamcs: No Rate Limiting on Authentication Endpoint
CVE-2026-44595 4.3 MEDIUM Yamcs: Unauthorized user enumeration via IAM API endpoints
CVE-2026-55548 4.3 MEDIUM Yamcs: Insecure Direct Object Reference (IDOR) in PacketsApi allows unprivileged users to

IV. Related Vulnerabilities

Same product: yamcs
Same vendor: yamcs
Same weakness: CWE-94

V. Comments for CVE-2026-46621

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