Product · X.Org

libX11

4 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

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High 7.5

CVE-2026-88806

libX11 XkbGetMap Reply Heap-based Buffer Overflow

A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.

X.Org libX11 libx11 libx11 Debian Ubuntu Azure Linux Alpine

Sep 21, 2026