---
title: "CVE-2026-93521: X.Org X Server - Buffer Overflow"
description: "X.Org X Server < 2.1.25 and XWayland < 24.4.14 contain a buffer overflow caused by improper handling of ChangeProviderProperty requests in RandR, letting authenticated X clients crash or execute code within the server context, exploit requires authenticated X client."
url: https://panop.io/threat-heartbeat/CVE-2026-93521/
---

# CVE-2026-93521 X.Org X Server - Buffer Overflow

X.Org X Server < 2.1.25 and XWayland < 24.4.14 contain a buffer overflow caused by improper handling of ChangeProviderProperty requests in RandR, letting authenticated X clients crash or execute code within the server context, exploit requires authenticated X client.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93521)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

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

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-122](https://cwe.mitre.org/data/definitions/122.html)

## Vendor fix

Update to X.Org X Server 2.1.25, XWayland 24.4.14 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-93521](https://nvd.nist.gov/vuln/detail/CVE-2026-93521)
- [https://gitlab.freedesktop.org/xorg/xserver/-/commit/5dc9efd5a199717b53f70b9c6cd336a522370e46](https://gitlab.freedesktop.org/xorg/xserver/-/commit/5dc9efd5a199717b53f70b9c6cd336a522370e46)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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