An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before 1.8.4 could be used by malicous servers to crash the X client.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-1b60a5536e advisory.

    libXi 1.8.4, fixes CVE-2026-109090, CVE-2026-109089, CVE-2026-94282, CVE-2026-94281, CVE-2026-93545,     CVE-2026-93544, CVE-2026-93543, CVE-2026-93542, CVE-2026-93541

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-142325 advisory.

    An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before     1.8.4 could be used by malicous servers to crash the X client.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - A malicious X server could cause a heap overflow by injecting a large DEVICE_ENABLE reply when processed
    by libXi before 1.8.4. (CVE-2026-109090)

  - An out-of-bounds read in libXi's XQueryDeviceState() in libXi before 1.8.4 could be used by a
    (CVE-2026-93541)

  - An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before
    1.8.4 could be used by malicous servers to crash the X client. (CVE-2026-93542)

  - 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. (CVE-2026-93543)

  - An out-of-bounds read in libXi's XI2 XIQueryDevice reply parsing in libXi before 1.8.4 can be used by a
    malicious X server to crash an attached X client. (CVE-2026-93544)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 9022f1ac-ca25-11f1-ada1-ac5afc632ba3 advisory.

    X.Org reports:
    Multiple issues have been found in the X client library               implementations published by X.Org for which we are               releasing security fixes for.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of libXi installed on the remote host is prior to 1.8.4. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-289-02 advisory.

    New libXi packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the libXi security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before
    1.8.4 could be used by malicous servers to crash the X client. (CVE-2026-93542)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before     1.8.4 could be used by malicous servers to crash the X client. (CVE-2026-93542)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
374609	Fedora 45 : libXi (2026-1b60a5536e)	Nessus	Fedora Local Security Checks	Local	high
370106	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: libXi (UTSA-2026-142325)	Nessus	Unity Linux Local Security Checks	Local	medium
476148	Alpine: libxi: security update to 1.8.4-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	high
476148	Alpine: libxi: security update to 1.8.4-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	high
366970	FreeBSD : libXi -- multiple vulnerabilities (9022f1ac-ca25-11f1-ada1-ac5afc632ba3)	Nessus	FreeBSD Local Security Checks	Local	high
366713	Slackware Linux 15.0 / current libXi Multiple Vulnerabilities (SSA:2026-289-02)	Nessus	Slackware Local Security Checks	Local	high
472769	Echo: libxi: security update to 2:1.8.2-1+e1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
472769	Echo: libxi: security update to 2:1.8.2-1+e1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
349962	Linux Distros Unpatched Vulnerability : CVE-2026-93542	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-93542

medium

Tenable Plugins

high

medium

high

high

high

high

medium

medium

medium