CVE-2026-93543 Out-of-bounds read in libXi's XI2 class parser
A malicious X server can crash an attached X client via an out-of-bounds read in the libXi library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-93543?
CVE-2026-93543 is a high-severity memory corruption vulnerability in x.org libXi, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An out-of-bounds read in libXi's XI2 class parser in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.
Weakness: CWE-125
Which versions are affected by CVE-2026-93543?
Linux distribution packages (8)
libXi AlmaLinux:10 | All versions | 1.8.1-7.el10_2.1 |
libXi-devel AlmaLinux:10 | All versions | 1.8.1-7.el10_2.1 |
libXi AlmaLinux:8 | All versions | 1.7.10-2.el8_10 |
libXi-devel AlmaLinux:8 | All versions | 1.7.10-2.el8_10 |
libXi AlmaLinux:9 | All versions | 1.7.10-8.el9_8.1 |
libXi-devel AlmaLinux:9 | All versions | 1.7.10-8.el9_8.1 |
libXi Rocky Linux:10 | All versions | 0:1.8.1-7.el10_2.1 |
libXi Rocky Linux:8 | All versions | 0:1.7.10-2.el8_10 |
How do I fix CVE-2026-93543?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-93543 being exploited?
There is no known exploitation of CVE-2026-93543 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-93543, ALSA-2026:91004, ALSA-2026:91056, ALSA-2026:91268, AZL-104066, BELL-CVE-2026-93543 and 8 more.