ZDI-26-906: X.Org Server libX11 XkbGetMap Reply Heap-based Buffer Overflow Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on affected installations of X.Org Server. User interaction is required to exploit this vulnerability in that the target must connect to a malicious X11 server. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-88806.