---
id: CVE-2026-109089
title: libXi XGetDeviceControl Control Type Mismatch Heap Buffer Overflow
summary: >-
  A buffer overflow when handling DEVICE_RESOLUTION in libXi before 1.8.4 could
  overflow a heap, triggered by a malicious X server.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-122
vendor: X.Org
product: libXi
affected:
  - libXi < 1.8.4
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T16:05:56.113Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109089'
references:
  - url: 'https://gitlab.freedesktop.org/xorg/lib/libxi/-/commit/f7836d0a0'
tags:
  - cve.org
ingestedAt: '2026-10-27T16:32:34.410Z'
---

## Overview

A buffer overflow when handling DEVICE_RESOLUTION in libXi before 1.8.4 could overflow a heap, triggered by a malicious X server.

## Affected

- `libXi < 1.8.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.