This vulnerability in libX11, a core X.Org library, involves a heap-based buffer overflow triggered by a malicious X server when processing the XkbGetMap request. The overflow affects the key_sym_map buffer, potentially allowing an attacker to execute arbitrary code or cause a denial of service. The issue affects all libX11 versions from 0 up to but not including 1.8.14.

Successful exploitation could lead to high impact including confidentiality, integrity, and availability compromises. An attacker controlling a malicious X server could exploit this flaw to execute arbitrary code or crash the client application using libX11, potentially leading to system compromise or denial of service.

No official patch or fix link is provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid connecting to untrusted or malicious X servers and consider restricting access to trusted X servers only.