CVE-2026-34002

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34002", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-03-25T04:53:13.615Z", "datePublished": "2026-05-05T14:41:10.065Z", "dateUpdated": "2026-11-05T20:29:02.857Z"}, "containers": {"cna": {"title": "Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling", "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 vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. 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Esto puede llevar a la exposici\u00f3n de informaci\u00f3n sensible o causar que el servidor se bloquee, lo que resulta en una denegaci\u00f3n de servicio."}], "id": "CVE-2026-34002", "lastModified": "2026-11-05T21:18:46.967", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 4.2, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34002", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-06T14:27:00.488000Z", "version": "2.0.3"}}]}, "published": "2026-05-05T16:16:11.787", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20547"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20555"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20557"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20558"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20560"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20561"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20562"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20563"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20575"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20576"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:20590"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:21699"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:21712"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:21715"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:21716"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:21718"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:21741"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:21742"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:22424"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:22456"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:23254"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:23255"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:23496"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:24341"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-34002"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451112"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-805"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Jan-Niklas Sohn (TrendAI Zero Day Initiative) for reporting this issue.", "bugzilla": {"description": "xorg: xwayland: X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in XKB modifier map handling", "id": "2451112", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451112"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L", "status": "draft"}, "cwe": "CWE-805", "details": ["A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service."], "mitigation": {"lang": "en:us", "value": "To mitigate this vulnerability, restrict access to the X11 server. If the X.Org X server is not required on a system, consider disabling or uninstalling it. For systems where the X server is necessary, ensure that access is limited to trusted users and networks. This can involve configuring `xhost` or implementing firewall rules to restrict connections to the X server. Any changes to X server configuration or service status may require a restart of the X server for the mitigation to take effect, which will impact active graphical sessions."}, "name": "CVE-2026-34002", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "xorg-x11-server-Xwayland", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "tigervnc", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "xorg-x11-server", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "tigervnc", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "xorg-x11-server", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "tigervnc", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "impact": "moderate", "package_name": "xorg-x11-server", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "impact": "moderate", "package_name": "xorg-x11-server-Xwayland", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "tigervnc", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "impact": "moderate", "package_name": "xorg-x11-server", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "impact": "moderate", "package_name": "xorg-x11-server-Xwayland", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-05T14:01:46Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34002\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34002"], "statement": "Moderate: This out-of-bounds read vulnerability in the X.Org X server's XKB modifier map handling could lead to information disclosure or service crashes. An attacker with access to the X11 server can trigger this without user interaction. This affects systems running the X.Org X server.", "threat_severity": "Moderate"}

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