CVE-2026-46562
Critical · 9.8Yamcs Vulnerable to Remote Code Execution via Mission Database algorithm override
CVSS
9.8
EPSS
1.0%
Published
May 27, 2026
CISA due date
—
The record
The Nashorn `ScriptEngine` used to evaluate user-supplied algorithm text in `MdbOverrideApi.updateAlgorithm` is constructed without a `ClassFilter`, allowing a user with the `ChangeMissionDatabase` privilege to execute arbitrary Java code on the Yamcs server. In Yamcs's default configuration (no `security.yaml`), the built-in `guest` user has `superuser=true`, so the vulnerability is reachable without authentication.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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