Vulnerability DatabaseCVE-2026-93520
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CVE-2026-93520
Published:October 28, 2026
Updated:October 30, 2026
A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.
Affected Packages
xwayland (CONDA):
Affected version(s) =24.1.13 <24.1.14
Fix Suggestion:
Update to version 24.1.14
xorg-xvfb-server (CONDA):
Affected version(s) >=21.1.23 <21.1.25
Fix Suggestion:
Update to version 21.1.25
https://gitlab.freedesktop.org/xorg/xserver.git (SCM_GIT):
Affected version(s) >=xwayland-26.0.99.901 <xwayland-26.0.99.903
Fix Suggestion:
Update to version xwayland-26.0.99.903
https://gitlab.freedesktop.org/xorg/xserver.git (SCM_GIT):
Affected version(s) >=xwayland-21.0.99.901 <xwayland-24.1.14 || >=xwayland-22.0.99.901 <xwayland-24.1.14 || >=xwayland-23.0.99.901 <xwayland-24.1.14 || >=xwayland-24.0.99.901 <xwayland-24.1.14
Fix Suggestion:
Update to version xwayland-24.1.14
https://gitlab.freedesktop.org/xorg/xserver.git (SCM_GIT):
Affected version(s) >=xorg-server-26.0.99.901 <xorg-server-26.0.99.903
Fix Suggestion:
Update to version xorg-server-26.0.99.903
https://gitlab.freedesktop.org/xorg/xserver.git (SCM_GIT):
Affected version(s) =xorg-server-0_99_1 <xorg-server-21.1.25 || >=xorg-server-1_0_99_1 <xorg-server-21.1.25 || >=xorg-server-21.0.99.1 <xorg-server-21.1.25
Fix Suggestion:
Update to version xorg-server-21.1.25
Related Resources (2)
https://nvd.nist.gov/vuln/detail/CVE-2026-93520
https://gitlab.freedesktop.org/xorg/xserver/-/commit/b941a473e06f26a407a9adb15759be79f7418e86
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CVSS v4
Base Score:
8.5
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.8
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Heap-based Buffer Overflow
CWE-122
EPSS
Base Score:
0.20