---
title: "CVE-2026-93543: libXi - Denial of Service"
description: "libXi < 1.8.4 contains an out-of-bounds read caused by improper bounds checking in the XI2 class parser, letting malicious X servers crash attached X clients, exploit requires malicious X server."
url: https://panop.io/threat-heartbeat/CVE-2026-93543/
---

# CVE-2026-93543 libXi - Denial of Service

libXi < 1.8.4 contains an out-of-bounds read caused by improper bounds checking in the XI2 class parser, letting malicious X servers crash attached X clients, exploit requires malicious X server.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.25% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93543)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

24 September 2026

Updated

15 October 2026

Weakness

[CWE-125](https://cwe.mitre.org/data/definitions/125.html)

## Vendor fix

Update to version 1.8.4 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-2026-93543](https://nvd.nist.gov/vuln/detail/CVE-2026-93543)
- [https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge\_requests/23/diffs?commit\_id=e2089ab748828273f916bbffd4e65b506aa50fdc](https://gitlab.freedesktop.org/xorg/lib/libxi/-/merge_requests/23/diffs?commit_id=e2089ab748828273f916bbffd4e65b506aa50fdc)

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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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