The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2023:7029 advisory.

    The libX11 packages contain the core X11 protocol client library.

    Security Fix(es):

    * libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request     leads to a buffer overflow (CVE-2023-3138)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.9 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise 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.

The remote MiracleLinux 9 host has packages installed that are affected by a vulnerability as referenced in the AXSA:2023-6905:01 advisory.

    * libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request     leads to a buffer overflow (CVE-2023-3138)

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

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

An update of the libX11 package has been released.

The Rocky Linux 8.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-2026_0099 advisory.

    This advisory aggregates security fixes for the libX11 SRPM in CIQ LTS 8.6. It addresses 6 CVEs:
    CVE-2023-43786, CVE-2023-43785, CVE-2023-43787, CVE-2023-3138, CVE-2020-14363, and 1 more.

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

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

According to the versions of the libX11 package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in     libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of     the arrays that those functions write to, using those IDs as array indexes. They trust that they were     called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X     servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-     bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other     portions of the Display structure and not write outside the bounds of the Display structure itself,     possibly causing the client to crash with this memory corruption. (CVE-2023-3138)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Debian 11 / 12 host has packages installed that are affected by a vulnerability as referenced in the dsa-5433 advisory.

    Gregory James Duck reported that missing input validation in various functions provided by libx11, the X11     client-side library, may result in denial of service. For the oldstable distribution (bullseye), this     problem has been fixed in version 2:1.7.2-1+deb11u1. For the stable distribution (bookworm), this problem     has been fixed in version 2:1.8.4-2+deb12u1. We recommend that you upgrade your libx11 packages. For the     detailed security status of libx11 please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/libx11

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

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

The remote NewStart CGSL host, running version MAIN 6.02, has libX11 packages installed that are affected by multiple vulnerabilities:

  - A missing validation flaw was found in libX11. This flaw allows an attacker to inject X11 protocol     commands on X clients, and in some cases, also bypass, authenticate (via injection of control characters),     or potentially execute arbitrary code with permissions of the application compiled with libX11. The     highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
    (CVE-2021-31535)

  - A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in     libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of     the arrays that those functions write to, using those IDs as array indexes. They trust that they were     called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X     servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-     bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other     portions of the Display structure and not write outside the bounds of the Display structure itself,     possibly causing the client to crash with this memory corruption. (CVE-2023-3138)

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

ID	Name	Product	Family	Published	Updated	Severity
185665	RHEL 8 : libX11 (RHSA-2023:7029)	Nessus	Red Hat Local Security Checks	11/14/2023	11/7/2024	high
293277	MiracleLinux 9 : libX11-1.7.0-8.el9 (AXSA:2023-6905:01)	Nessus	Miracle Linux Local Security Checks	1/20/2026	1/20/2026	high
334107	Photon OS 5.0: Libx11 PHSA-2023-5.0-92-0029	Nessus	PhotonOS Local Security Checks	8/10/2026	8/10/2026	high
358765	Rocky Linux 8.6 [CIQ] Security Update: libX11 / libX11-common / libX11-debuginfo / libX11-debugsource / etc Multiple Vulnerabilities (ciqsa-2026_0099)	Nessus	Rocky Linux Local Security Checks	10/1/2026	10/11/2026	critical
188346	EulerOS Virtualization 2.11.1 : libX11 (EulerOS-SA-2023-3056)	Nessus	Huawei Local Security Checks	1/16/2024	1/16/2024	high
177478	Debian DSA-5433-1 : libx11 - security update	Nessus	Debian Local Security Checks	6/21/2023	1/24/2025	high
206845	NewStart CGSL MAIN 6.02 : libX11 Multiple Vulnerabilities (NS-SA-2024-0059)	Nessus	NewStart CGSL Local Security Checks	9/10/2024	9/10/2024	critical
333644	Photon OS 5.0: Libx11 PHSA-2023-5.0-91-0029	Nessus	PhotonOS Local Security Checks	8/10/2026	8/10/2026	high

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