High

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libxfont2 name length mismatch

Type: advisorySource: Official CVE List1 source record

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.

Announced 5 Jun 2026Group revision 1

Original source ↗

CVE-2026-50256

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-50256

Red Hat Enterprise Linux 10

Source reference: /containers/cna/affected/0/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 10.0 Extended Update Support

Source reference: /containers/cna/affected/1/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION

Source reference: /containers/cna/affected/2/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 7 Extended Lifecycle Support

Source reference: /containers/cna/affected/3/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 7 Extended Lifecycle Support

Source reference: /containers/cna/affected/4/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8

Source reference: /containers/cna/affected/5/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8

Source reference: /containers/cna/affected/6/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8

Source reference: /containers/cna/affected/7/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/8/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/9/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/10/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/11/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/12/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/13/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

Source reference: /containers/cna/affected/14/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/15/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/16/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Source reference: /containers/cna/affected/17/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Source reference: /containers/cna/affected/18/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Source reference: /containers/cna/affected/19/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Source reference: /containers/cna/affected/20/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Source reference: /containers/cna/affected/21/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Source reference: /containers/cna/affected/22/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Source reference: /containers/cna/affected/23/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9

Source reference: /containers/cna/affected/24/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9

Source reference: /containers/cna/affected/25/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9

Source reference: /containers/cna/affected/26/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Source reference: /containers/cna/affected/27/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Source reference: /containers/cna/affected/28/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Source reference: /containers/cna/affected/29/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Source reference: /containers/cna/affected/30/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Source reference: /containers/cna/affected/31/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Source reference: /containers/cna/affected/32/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.6 Extended Update Support

Source reference: /containers/cna/affected/33/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.6 Extended Update Support

Source reference: /containers/cna/affected/34/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 9.6 Extended Update Support

Source reference: /containers/cna/affected/35/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Red Hat Enterprise Linux 6

Source reference: /containers/cna/affected/36/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

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      "cpe:/o:redhat:enterprise_linux:10.2"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 10",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:24.1.9-4.el10_2.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/o:redhat:enterprise_linux_eus:10.0"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:24.1.5-6.el10_0.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/o:redhat:rhel_els:6"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 6 Extended Lifecycle Support  - EXTENSION",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.1.0-25.el6_10.18",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/o:redhat:rhel_els:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.4-35.el7_9",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/o:redhat:rhel_els:7"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.8.0-36.el7_9.5",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:8::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:21.1.3-20.el8_10.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:8::appstream",
      "cpe:/a:redhat:enterprise_linux:8::crb"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.11-28.el8_10.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:8::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.15.0-10.el8_10",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.4::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.10-5.el8_4",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.4::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.11.0-8.el8_4.16",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.4::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.10-5.el8_4",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.4::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.4::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "versions": [
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        "status": "unaffected",
        "version": "0:1.11.0-8.el8_4.16",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.11-8.el8_6",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:21.1.3-2.el8_6.7",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.12.0-6.el8_6.18",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
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  {
    "cpes": [
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      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.11-8.el8_6",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:21.1.3-2.el8_6.7",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_aus:8.6::appstream",
      "cpe:/a:redhat:rhel_eus_long_life:8.6::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.12.0-6.el8_6.18",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.11-19.el8_8",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:21.1.3-13.el8_8.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.12.0-15.el8_8.18",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.11-19.el8_8",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:21.1.3-13.el8_8.1",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.12.0-15.el8_8.18",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9::appstream",
      "cpe:/a:redhat:enterprise_linux:9::crb"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:24.1.9-4.el9_8.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9::appstream",
      "cpe:/a:redhat:enterprise_linux:9::crb"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.11-34.el9_8.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.15.0-7.el9_8.2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:9.2::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.11-21.el9_2",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
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      "cpe:/a:redhat:rhel_e4s:9.2::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:21.1.3-10.el9_2.1",
        "lessThan": "*",
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      }
    ],
    "packageName": "xorg-x11-server-Xwayland",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
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    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.12.0-14.el9_2.15",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
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    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.20.11-29.el9_4",
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        "versionType": "rpm"
      }
    ],
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    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "versions": [
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        "versionType": "rpm"
      }
    ],
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    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
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    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "versions": [
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        "versionType": "rpm"
      }
    ],
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    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
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    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "versions": [
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        "status": "unaffected",
        "version": "0:1.20.11-34.el9_6",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
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    "product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "versions": [
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        "version": "0:23.2.7-6.el9_6.1",
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        "versionType": "rpm"
      }
    ],
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    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:rhel_eus:9.6::appstream"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "versions": [
      {
        "status": "unaffected",
        "version": "0:1.14.1-11.el9_6",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "tigervnc",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:6"
    ],
    "vendor": "Red Hat",
    "product": "Red Hat Enterprise Linux 6",
    "packageName": "xorg-x11-server",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "defaultStatus": "unknown"
  }
]

Related CVEs: CVE-2026-50256
Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event: #3009 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 21:28:24 GMT
Publisher date: Fri, 05 Jun 2026 10:31:22 GMT

Read the original announcement

Revision history

24 Oct 2026CVE-2026-50256 · Revision 1Source updated