The remote MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2026-805:03 advisory.

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)
      * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)
      * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)
      * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap     request via mapWidths indexing (CVE-2026-50259)
      * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)
      * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)
      * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)
      * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)
      * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)     Bug Fix(es) and Enhancement(s):
      * [xwayland] Backport other security fixes without a CVE assigned [rhel-8.10.z] (JIRA:RHEL-184293)

Tenable has extracted the preceding description block directly from the MiracleLinux 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 remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36086 advisory.

    X.Org is an open-source implementation of the X Window System. It provides the basic low-level     functionality that full-fledged graphical user interfaces are designed upon.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request     via mapWidths indexing (CVE-2026-50259)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:36632 advisory.

    Xwayland is an X server for running X clients under Wayland.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request     via mapWidths indexing (CVE-2026-50259)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36634 advisory.

    Xwayland is an X server for running X clients under Wayland.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request     via mapWidths indexing (CVE-2026-50259)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36792 advisory.

    X.Org is an open-source implementation of the X Window System. It provides the basic low-level     functionality that full-fledged graphical user interfaces are designed upon.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request     via mapWidths indexing (CVE-2026-50259)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36791 advisory.

    X.Org is an open-source implementation of the X Window System. It provides the basic low-level     functionality that full-fledged graphical user interfaces are designed upon.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request     via mapWidths indexing (CVE-2026-50259)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:36798 advisory.

    Xwayland is an X server for running X clients under Wayland.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request     via mapWidths indexing (CVE-2026-50259)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:38502 advisory.

    Xwayland is an X server for running X clients under Wayland.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request     via mapWidths indexing (CVE-2026-50259)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

    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.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:38810 advisory.

    Xwayland is an X server for running X clients under Wayland.

    Security Fix(es):

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias     resolution due to libXfont2 name length mismatch (CVE-2026-50256)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()     (CVE-2026-50257)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due     to unchecked shift levels (CVE-2026-50258)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request     via mapWidths indexing (CVE-2026-50259)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()     (CVE-2026-50260)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()     (CVE-2026-50261)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX     ChangeDrawableAttributes (CVE-2026-50262)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in     CreateSaverWindow() (CVE-2026-50263)

    * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2     DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

    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.

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

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

ID	名稱	產品	系列	已發布	已更新	嚴重性
321746	MiracleLinux 8 : xorg-x11-server-Xwayland-21.1.3-20.el8_10.2 (AXSA:2026-805:03)	Nessus	Miracle Linux Local Security Checks	2026/6/20	2026/6/20	high
325469	RHEL 9 : xorg-x11-server (RHSA-2026:36086)	Nessus	Red Hat Local Security Checks	2026/7/7	2026/7/7	high
325673	RHEL 9 : xorg-x11-server-Xwayland (RHSA-2026:36632)	Nessus	Red Hat Local Security Checks	2026/7/8	2026/7/8	high
325674	RHEL 9 : xorg-x11-server-Xwayland (RHSA-2026:36634)	Nessus	Red Hat Local Security Checks	2026/7/8	2026/7/8	high
325741	RHEL 8 : xorg-x11-server (RHSA-2026:36792)	Nessus	Red Hat Local Security Checks	2026/7/9	2026/7/9	high
325742	RHEL 8 : xorg-x11-server (RHSA-2026:36791)	Nessus	Red Hat Local Security Checks	2026/7/9	2026/7/9	high
325810	RHEL 10 : xorg-x11-server-Xwayland (RHSA-2026:36798)	Nessus	Red Hat Local Security Checks	2026/7/9	2026/7/9	high
326455	RHEL 8 : xorg-x11-server-Xwayland (RHSA-2026:38502)	Nessus	Red Hat Local Security Checks	2026/7/13	2026/7/13	high
326469	RHEL 8 : xorg-x11-server-Xwayland (RHSA-2026:38810)	Nessus	Red Hat Local Security Checks	2026/7/13	2026/7/13	high

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