CVE-2026-46562: Yamcs Vulnerable to Remote Code Execution via Mission Database algorithm override

May 27, 2026

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.

References

github.com/advisories/GHSA-vmwp-vh32-rj75
github.com/yamcs/yamcs/security/advisories/GHSA-vmwp-vh32-rj75
nvd.nist.gov/vuln/detail/CVE-2026-46562

Code Behaviors & Features

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