CVE-2026-88806CWE-122

CVE-2026-88806

High · published September 21, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
9.2
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00199 · 9.2th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-09-21T18:17Z
References (1)
https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/309 · [email protected]
EPSS history
Timeline
  • 23 SEP 03:48Z
    EPSS moved — → 0%
    epss
  • 21 SEP 13:42Z
    libX11 XkbGetMap Reply Heap-based Buffer Overflow
    cvelistv5