{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"High" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"xorg-x11-server-xwayland security update", "category":"general", "title":"Synopsis" }, { "text":"An update for xorg-x11-server-xwayland is now available for openEuler-22.03-LTS-SP4", "category":"general", "title":"Summary" }, { "text":"Xwayland is an X server for running X clients under Wayland. %package devel Summary: Development package Requires: pkgconfig %description devel The development package provides the developmental files which are necessary for developing Wayland compositors using Xwayland. %prep %autosetup -n xwayland- -p1 %build %meson \\ -Ddefault_font_path="catalogue:/etc/X11/fontpath.d,built-ins" \\ -Dbuilder_string="Build ID: -" \\ -Dxkb_output_dir=/lib/xkb \\ -Dxcsecurity=true \\ -Dglamor=true \\ -Ddri3=true %meson_build\n\nSecurity Fix(es):\n\n['Hi all,\\n\\nCVEs have been issued now, please see inline below\\n\\nOn Tue, Jun 02, 2026 at 10:01:46AM +1000, Peter Hutterer wrote:', \"=======================================================================\\nX.Org Security Advisory: June 2, 2026 \\n\\nIssues in X.Org X server prior to 21.1.23 and Xwayland prior to 24.1.12\\n=======================================================================\\n\\nMultiple issues have been found in the X server and Xwayland implementations\\npublished by X.Org for which we are releasing security fixes for in\\nxorg-server-21.1.23 and xwayland-24.1.12.\\n\\nNote that CVEs have been requested for these issues but did not get assigned in\\ntime for this disclosure.\\n\\n* Font Alias Stack-based Buffer Overflow\\n\\n A mismatch between the X server and the libXfont2 library's maximum\\n font name length can cause a stack buffer overflow during font alias\\n resolution. The server allocates a 256 byte stack buffer but libXfont2's\\n alias target name length is 1024 bytes. A font alias name between 257\\n and 1023 bytes causes the X server to copy that name into the undersized\\n stack buffer without further checks.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:\", 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30136)', 'This issue has been assigned CVE-2026-50256', '* XSYNC Use-After-Free in miSyncDestroyFence()\\n\\n A client that sets up multiple fence triggers can trigger a\\n use-after-free function pointer call. An attacker would connect to the\\n X server to set up a fence and await that fence, then a second X\\n connection destroys the fence, causing the use-after-free.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30159)', 'This issue has been assigned CVE-2026-50257', '* XKB Key Types Stack-based Buffer Overflow\\n\\n The X server has multiple stack buffers that are sized\\n XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify\\n or clamp non-canonical key types to XkbMaxShiftLevel. A client can\\n change key types to excessive shift levels and trigger three separate\\n stack overflows.\\n\\n This is caused by an incomplete fix of CVE-2025-26597.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30160)', 'This issue has been assigned CVE-2026-50258', '* XKB SetMap Request Stack-based Buffer Overflow\\n\\n _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256]\\n indexed by key type index. The helper function CheckKeyTypes() writes\\n to this buffer at a client-controlled offset, allowing a stack buffer\\n overflow.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30161)', 'This issue has been assigned CVE-2026-50259', '* XSYNC Use-After-Free in FreeCounter()\\n\\n A client that sets up multiple SyncCounters and awaits on those\\n triggers can trigger a use-after-free when destroying those counters\\n via a second client connection.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30163)', 'This issue has been assigned CVE-2026-50260', '* XSYNC Use-After-Free in SyncChangeCounter()\\n\\n A client that sets up multiple SyncCounters can trigger a use-after-free\\n when destroying those counters via a second client connection while\\n changing those counters.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30164)', 'This issue has been assigned CVE-2026-50261', '* GLX ChangeDrawableAttributes Out-Of-Bounds Read/Write\\n\\n A wrong size validation check in __glXDisp_ChangeDrawableAttributes()\\n can read (or write) a client-contr(CVE-2026-50256)", "category":"general", "title":"Description" }, { "text":"An update for xorg-x11-server-xwayland is now available for openEuler-22.03-LTS-SP4.\n\nopenEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section.", "category":"general", "title":"Topic" }, { "text":"High", "category":"general", "title":"Severity" }, { "text":"xorg-x11-server-xwayland", "category":"general", "title":"Affected Component" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"openEuler-SA-2026-4728", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4728" }, { "summary":"CVE-2026-50256", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-50256&packageName=xorg-x11-server-xwayland" }, { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50256" }, { "summary":"openEuler-SA-2026-4728 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/advisories/2026/csaf-openeuler-sa-2026-4728.json" } ], "title":"An update for xorg-x11-server-xwayland is now available for openEuler-22.03-LTS-SP4", "tracking":{ "initial_release_date":"2026-11-09T09:27:22+08:00", "revision_history":[ { "date":"2026-11-09T09:27:22+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-11-09T09:27:22+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-11-09T09:27:22+08:00", "id":"openEuler-SA-2026-4728", "version":"1.0.0", "status":"final" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", 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"product_id":"xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.aarch64.rpm", "name":"xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.aarch64.rpm" }, "name":"xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.aarch64.rpm", "category":"product_version" }, { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.aarch64.rpm", "name":"xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.aarch64.rpm" }, "name":"xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.aarch64.rpm", "category":"product_version" } ], "category":"architecture" }, { "name":"src", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.src.rpm", "name":"xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.src.rpm" }, "name":"xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.src.rpm", "category":"product_version" } ], "category":"architecture" }, { "name":"x86_64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.x86_64.rpm", "name":"xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.x86_64.rpm" }, "name":"xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.x86_64.rpm", "category":"product_version" }, { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.x86_64.rpm", "name":"xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.x86_64.rpm" }, "name":"xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.x86_64.rpm", "category":"product_version" }, { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.x86_64.rpm", "name":"xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.x86_64.rpm" }, "name":"xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.x86_64.rpm", "category":"product_version" }, { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64.rpm", "name":"xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64.rpm" }, "name":"xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64.rpm", "category":"product_version" } ], "category":"architecture" } ] } ], "relationships":[ { "relates_to_product_reference":"openEuler-22.03-LTS-SP4", "product_reference":"xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.aarch64.rpm", "full_product_name":{ "product_id":"openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.aarch64", "name":"xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.aarch64 as a component of openEuler-22.03-LTS-SP4" }, "category":"default_component_of" }, 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{ "relates_to_product_reference":"openEuler-22.03-LTS-SP4", "product_reference":"xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64.rpm", "full_product_name":{ "product_id":"openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64", "name":"xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64 as a component of openEuler-22.03-LTS-SP4" }, "category":"default_component_of" } ] }, "vulnerabilities":[ { "cve":"CVE-2026-50256", "notes":[ { "text":"['Hi all,\\n\\nCVEs have been issued now, please see inline below\\n\\nOn Tue, Jun 02, 2026 at 10:01:46AM +1000, Peter Hutterer wrote:', \"=======================================================================\\nX.Org Security Advisory: June 2, 2026 \\n\\nIssues in X.Org X server prior to 21.1.23 and Xwayland prior to 24.1.12\\n=======================================================================\\n\\nMultiple issues have been found in the X server and Xwayland implementations\\npublished by X.Org for which we are releasing security fixes for in\\nxorg-server-21.1.23 and xwayland-24.1.12.\\n\\nNote that CVEs have been requested for these issues but did not get assigned in\\ntime for this disclosure.\\n\\n* Font Alias Stack-based Buffer Overflow\\n\\n A mismatch between the X server and the libXfont2 library's maximum\\n font name length can cause a stack buffer overflow during font alias\\n resolution. The server allocates a 256 byte stack buffer but libXfont2's\\n alias target name length is 1024 bytes. A font alias name between 257\\n and 1023 bytes causes the X server to copy that name into the undersized\\n stack buffer without further checks.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:\", 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30136)', 'This issue has been assigned CVE-2026-50256', '* XSYNC Use-After-Free in miSyncDestroyFence()\\n\\n A client that sets up multiple fence triggers can trigger a\\n use-after-free function pointer call. An attacker would connect to the\\n X server to set up a fence and await that fence, then a second X\\n connection destroys the fence, causing the use-after-free.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30159)', 'This issue has been assigned CVE-2026-50257', '* XKB Key Types Stack-based Buffer Overflow\\n\\n The X server has multiple stack buffers that are sized\\n XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify\\n or clamp non-canonical key types to XkbMaxShiftLevel. A client can\\n change key types to excessive shift levels and trigger three separate\\n stack overflows.\\n\\n This is caused by an incomplete fix of CVE-2025-26597.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30160)', 'This issue has been assigned CVE-2026-50258', '* XKB SetMap Request Stack-based Buffer Overflow\\n\\n _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256]\\n indexed by key type index. The helper function CheckKeyTypes() writes\\n to this buffer at a client-controlled offset, allowing a stack buffer\\n overflow.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30161)', 'This issue has been assigned CVE-2026-50259', '* XSYNC Use-After-Free in FreeCounter()\\n\\n A client that sets up multiple SyncCounters and awaits on those\\n triggers can trigger a use-after-free when destroying those counters\\n via a second client connection.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30163)', 'This issue has been assigned CVE-2026-50260', '* XSYNC Use-After-Free in SyncChangeCounter()\\n\\n A client that sets up multiple SyncCounters can trigger a use-after-free\\n when destroying those counters via a second client connection while\\n changing those counters.\\n\\n Fixed in: xorg-server-21.1.23 and xwayland-24.1.12\\n Fix:', 'Found by: Anonymous working with TrendAI Zero Day Initiative.\\n (ZDI-CAN-30164)', 'This issue has been assigned CVE-2026-50261', '* GLX ChangeDrawableAttributes Out-Of-Bounds Read/Write\\n\\n A wrong size validation check in __glXDisp_ChangeDrawableAttributes()\\n can read (or write) a client-contr", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.src", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64" ] }, "remediations":[ { "product_ids":[ "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.src", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64" ], "details":"xorg-x11-server-xwayland security update", "category":"vendor_fix", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4728" } ], "scores":[ { "cvss_v3":{ "baseSeverity":"HIGH", "baseScore":7.8, "vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version":"3.1" }, "products":[ "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.src", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debuginfo-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-debugsource-22.1.2-38.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:xorg-x11-server-Xwayland-devel-22.1.2-38.oe2203sp4.x86_64" ] } ], "threats":[ { "details":"High", "category":"impact" } ], "title":"CVE-2026-50256" } ] }