CVE-2026-93520
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Heap Buffer Overflow in X.org X Server

Publication date: 2026-10-28

Last updated on: 2026-10-28

Assigner: SUSE

Description
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.

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Meta Information

Published
2026-10-28
Last Modified
2026-10-28
Generated
2026-10-28
AI Q&A
2026-10-28
EPSS Evaluated
N/A
NVD
CVE-2026-93520
EUVD
EUVD-2026-112135

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
x.org xorg-x11-server 0
x.org xwayland 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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Executive Summary

This is a heap buffer overflow vulnerability in the X.org X server and XWayland before specific versions. It occurs due to mismatching size calculations between XkbAllocNames and ChangeKeycodeRange functions. An authenticated X client could exploit this to crash the X server or potentially execute arbitrary code with the server's privileges.

Impact Analysis

If you use a vulnerable version of X.org X server or XWayland, an attacker with local access could exploit this flaw to crash your X server session or run malicious code as the X server, potentially gaining control over your system or accessing sensitive data.

Mitigation Strategies

Update X.org X server to version 2.1.25 or later and XWayland to version 24.1.14 or later to address the heap buffer overflow issue.

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