CVE-2026-88806 HIGH

CVE-2026-88806: libX11 XkbGetMap Reply Heap-based Buffer Overflow

Vendor X.org
Product libX11
Weakness CWE-122
Published September 21, 2026
Last update September 22, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

September 21, 2026 CVE published
September 22, 2026 Record updated