Artemis Java Test Sandbox versions before 1.11.2 are vulnerable to a sandbox escape when an attacker loads untrusted libraries using System.load or System.loadLibrary. An attacker can abuse this issue to execute arbitrary Java when a victim executes the supposedly sandboxed code.
https://vulncheck.com/advisories/vc-advisory-GHSA-98hq-4wmw-98w9
https://github.com/ls1intum/Ares/security/advisories/GHSA-98hq-4wmw-98w9