Buffer Overflow Vulnerability in X.Org X Server and XWayland by X.Org
CVE-2026-93519

7.8HIGH

Key Information:

Vendor

X.org

Status
Xorg-x11-server
Xwayland
Vendor
CVE Published:
28 October 2026

What is CVE-2026-93519?

A buffer overflow exists in the XFIXES extension of the X.Org X server versions prior to 21.1.25 and XWayland versions prior to 24.1.14. This vulnerability allows authenticated X clients to potentially cause a crash or execute arbitrary code in the context of the X server. Such an exploit could lead to various impacts on system integrity and availability, highlighting the importance of applying relevant security patches.

Affected Version(s)

xorg-x11-server 0 < 21.1.25

xwayland 0 < 24.1.14

References

https://gitlab.freedesktop.org/xorg/xserver/-/commit/1f42...
patch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Anonymous working with TrendAI Zero Day Initiative
.