{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-34000", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-03-25T04:53:13.614Z", "datePublished": "2026-05-05T14:41:05.468Z", "dateUpdated": "2026-06-08T03:30:12.287Z" }, "containers": { "cna": { "title": "Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.", "metrics": [ { "other": { "content": { "value": "Moderate", "namespace": "https://access.redhat.com/security/updates/classification/" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L", "version": "3.1" }, "format": "CVSS" } ], "descriptions": [ { "lang": "en", "value": "A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server." } ], "affected": [ { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10.0 Extended Update Support", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "xorg-x11-server-Xwayland", "defaultStatus": "affected", "versions": [ { "version": "0:24.1.5-6.el10_0", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/o:redhat:enterprise_linux_eus:10.0" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "tigervnc", "defaultStatus": "affected", "versions": [ { "version": "0:1.1.0-25.el6_10.16", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/o:redhat:rhel_els:6" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise 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"https://access.redhat.com/downloads/content/package-browser/", "packageName": "xorg-x11-server-Xwayland", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "xorg-x11-server", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "xorg-x11-server-Xwayland", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ] } ], "references": [ { "url": "https://access.redhat.com/errata/RHSA-2026:19342", "name": "RHSA-2026:19342", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2026:20547", "name": "RHSA-2026:20547", "tags": [ "vendor-advisory", 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On systems where a graphical environment is not required, consider disabling the X server entirely by setting the default system target to multi-user mode. For systems requiring the X server, ensure that X11 forwarding is disabled in SSH configurations if not explicitly needed, and restrict direct X11 connections to trusted users and networks through firewall rules. If changes are made to SSH configuration, the `sshd` service must be restarted. 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