A heap-buffer-overflow vulnerability exists in the cfg_mark_ports function of Unbound's config_file.c. This flaw can cause memory corruption when an attacker with local access provides specially crafted input. The issue may lead to application crashes or potentially allow arbitrary code execution, resulting in denial of service or unauthorized system actions. The vulnerability has a medium severity rating with a CVSS score of 4.8. Currently, no official fix or mitigation meeting Red Hat's criteria is available.