Artemis Java Test Sandbox versions less than 1.7.6 are vulnerable to a sandbox escape when an attacker crafts a special subclass of InvocationTargetException. 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-883x-6fch-6wjx
https://github.com/ls1intum/Ares/releases/tag/1.7.6
https://github.com/ls1intum/Ares/issues/15#issuecomment-996449371
https://github.com/ls1intum/Ares/commit/af4f28a56e2fe600d8750b3b415352a0a3217392