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Linux Distros Unpatched Vulnerability : CVE-2026-50263

🗓️ 05 Jun 2026 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 5 Views

Debian Linux packages xorg-server and xwayland have CVE-2026-50263 with no patch available.

Related
Refs
Code
ReporterTitlePublishedViews
Family
FreeBSD		xwayland -- Multiple vulnerabilities
1 Jun 202600:00
–freebsd
FreeBSD		xorg-server -- Multiple vulnerabilities
1 Jun 202600:00
–freebsd
ATTACKERKB		CVE-2026-50263
5 Jun 202610:36
–attackerkb
Circl		CVE-2026-50263
5 Jun 202613:43
–circl
CVE		CVE-2026-50263
5 Jun 202610:36
–cve
Cvelist		CVE-2026-50263 Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()
5 Jun 202610:36
–cvelist
Debian CVE		CVE-2026-50263
5 Jun 202610:36
–debiancve
EUVD		EUVD-2026-34820
5 Jun 202610:36
–euvd
Tenable Nessus		FreeBSD : xwayland -- Multiple vulnerabilities (36cb0ced-5e23-11f1-86a2-589cfc10a551)
6 Jun 202600:00
–nessus
Tenable Nessus		FreeBSD : xorg-server -- Multiple vulnerabilities (592ced15-5e20-11f1-86a2-589cfc10a551)
6 Jun 202600:00
–nessus
Rows per page
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##
# (C) Tenable, Inc.
##

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  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/05");

  script_cve_id("CVE-2026-50263");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-50263");

  script_set_attribute(attribute:"synopsis", value:
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  script_set_attribute(attribute:"description", value:
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  - A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can
    trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to
    information disclosure. (CVE-2026-50263)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-50263");
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  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-50263");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N");
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  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-50263");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
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  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
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  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
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  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xorg-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xorg-server-hwe-16.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xorg-server-hwe-18.04");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xwayland");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xdmx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xephyr");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xnest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xorg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xvfb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xwayland");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xwayland-devel");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:xorg-x11-server-Xwayland");
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if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "xdmx"},
          {"reference": "xdmx-tools"},
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "xdmx"},
          {"reference": "xdmx-tools"},
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "xdmx"},
          {"reference": "xdmx-tools"},
          {"reference": "xnest"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-dbg"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-xmir"},
          {"reference": "xvfb"}
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    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
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          {"reference": "xnest"},
          {"reference": "xorg-server-hwe-16.04"},
          {"reference": "xorg-server-source"},
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          {"reference": "xserver-xorg-legacy"},
          {"reference": "xserver-xorg-xmir"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "xdmx"},
          {"reference": "xdmx-tools"},
          {"reference": "xmir"},
          {"reference": "xnest"},
          {"reference": "xorg-server-hwe-18.04"},
          {"reference": "xorg-server-source"},
          {"reference": "xserver-common"},
          {"reference": "xserver-xephyr"},
          {"reference": "xserver-xorg-core"},
          {"reference": "xserver-xorg-core-udeb"},
          {"reference": "xserver-xorg-dev"},
          {"reference": "xserver-xorg-legacy"},
          {"reference": "xserver-xorg-xmir"},
          {"reference": "xvfb"},
          {"reference": "xwayland"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "xorg-x11-server-Xwayland"},
          {"reference": "xorg-x11-server-Xwayland-devel"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "xorg-x11-server"},
          {"reference": "xorg-x11-server-Xdmx"},
          {"reference": "xorg-x11-server-Xephyr"},
          {"reference": "xorg-x11-server-Xnest"},
          {"reference": "xorg-x11-server-Xorg"},
          {"reference": "xorg-x11-server-Xvfb"},
          {"reference": "xorg-x11-server-Xwayland"},
          {"reference": "xorg-x11-server-common"},
          {"reference": "xorg-x11-server-devel"},
          {"reference": "xorg-x11-server-source"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "xorg-x11-server"},
          {"reference": "xorg-x11-server-Xdmx"},
          {"reference": "xorg-x11-server-Xephyr"},
          {"reference": "xorg-x11-server-Xnest"},
          {"reference": "xorg-x11-server-Xorg"},
          {"reference": "xorg-x11-server-Xvfb"},
          {"reference": "xorg-x11-server-Xwayland"},
          {"reference": "xorg-x11-server-common"},
          {"reference": "xorg-x11-server-devel"},
          {"reference": "xorg-x11-server-source"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "xorg-x11-server"},
          {"reference": "xorg-x11-server-Xdmx"},
          {"reference": "xorg-x11-server-Xephyr"},
          {"reference": "xorg-x11-server-Xnest"},
          {"reference": "xorg-x11-server-Xorg"},
          {"reference": "xorg-x11-server-Xvfb"},
          {"reference": "xorg-x11-server-Xwayland"},
          {"reference": "xorg-x11-server-common"},
          {"reference": "xorg-x11-server-devel"},
          {"reference": "xorg-x11-server-source"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "xorg-x11-server"},
          {"reference": "xorg-x11-server-Xdmx"},
          {"reference": "xorg-x11-server-Xephyr"},
          {"reference": "xorg-x11-server-Xnest"},
          {"reference": "xorg-x11-server-Xorg"},
          {"reference": "xorg-x11-server-Xvfb"},
          {"reference": "xorg-x11-server-Xwayland"},
          {"reference": "xorg-x11-server-common"},
          {"reference": "xorg-x11-server-devel"},
          {"reference": "xorg-x11-server-source"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "xorg-x11-server"},
          {"reference": "xorg-x11-server-Xdmx"},
          {"reference": "xorg-x11-server-Xephyr"},
          {"reference": "xorg-x11-server-Xnest"},
          {"reference": "xorg-x11-server-Xorg"},
          {"reference": "xorg-x11-server-Xvfb"},
          {"reference": "xorg-x11-server-Xwayland"},
          {"reference": "xorg-x11-server-Xwayland-devel"},
          {"reference": "xorg-x11-server-common"},
          {"reference": "xorg-x11-server-devel"},
          {"reference": "xorg-x11-server-source"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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05 Jun 2026 00:00Current
5.5Medium risk
Vulners AI Score5.5
CVSS 3.15.5
EPSS0.00012
linux vulnerabilitydebian packagesxorg serverxwaylandno patch
5