CVE-2026-44632 Yamcs: Server-Side Code Injection (RCE) via Janino Expression Engine in `JavaExprAlgorithmExecutionFactory`
Authenticated users with specific privileges can inject Java code into algorithm definitions, leading to remote code execution on the host.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44632?
CVE-2026-44632 is a critical code injection vulnerability in yamcs, published on 16 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-94
Which versions are affected by CVE-2026-44632?
2 open source packages ship an affected version, including org.yamcs:yamcs-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.yamcs:yamcs-core Maven | All versions | 5.12.7 |
org.yamcs:yamcs-core Maven | All versions | 5.12.7 |
Products include Spaceapplications Yamcs.
How do I fix CVE-2026-44632?
Upgrade org.yamcs:yamcs-core to 5.12.7 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-44632 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44632 exists.
Other vulnerabilities in yamcs
- CVE-2026-46562 Yamcs: Remote Code Execution via Mission Database algorithm override
- CVE-2026-46621 Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection
- CVE-2023-45278 Yamcs API Directory Traversal vulnerability
- CVE-2023-45277 Yamcs Path Traversal vulnerability
- CVE-2026-44596 Yamcs: No Rate Limiting on Authentication Endpoint
Sources
Also known as GHSA-524g-x36v-9wm6.