{"schemaVersion":3,"id":"CVE-2026-34002","aliases":["UBUNTU-CVE-2026-34002","DEBIAN-CVE-2026-34002","CGA-cj6p-jj5v-pqwr","CGA-jv2v-5gc2-r866"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-05-05T14:41:10.065Z","modified":"2026-06-08T03:30:19.183Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.1,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.1,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","exploitability":10,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","exploitability":10,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00525,"percentile":0.43403,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.036000000000000004,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00489},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00525,"percentile":0.43403}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00489,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00525,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00525,"percentile":0.43403}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-805","name":"Buffer Access with Incorrect Length Value","description":"The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/805.html"}],"affected":[{"vendor":"chainguard","product":"xorg-server","name":"xorg-server","label":"xorg-server","ecosystem":"Chainguard","cpePart":null,"purl":"pkg:apk/chainguard/xorg-server","purlType":"apk","versions":[{"text":"< 21.1.22-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 21.1.22-r0","eol":null,"hubHref":null},{"vendor":"wolfi","product":"xorg-server","name":"xorg-server","label":"xorg-server","ecosystem":"Wolfi","cpePart":null,"purl":"pkg:apk/wolfi/xorg-server","purlType":"apk","versions":[{"text":"< 21.1.22-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 21.1.22-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"xorg-server","name":"xorg-server","label":"xorg-server","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/xorg-server","purlType":"deb","versions":[{"text":"< 2:21.1.7-3+deb12u12","noFixRecorded":false,"fixedIn":null},{"text":"< 2:21.1.16-1.3+deb13u2","noFixRecorded":false,"fixedIn":null},{"text":"< 2:21.1.22-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2:21.1.7-3+deb12u12 | < 2:21.1.16-1.3+deb13u2 | < 2:21.1.22-1","eol":null,"hubHref":null},{"vendor":"debian","product":"xwayland","name":"xwayland","label":"xwayland","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/xwayland","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2:24.1.10-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2:24.1.10-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xorg-server","name":"xorg-server","label":"xorg-server","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xorg-server","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xorg-server-hwe-16.04","name":"xorg-server-hwe-16.04","label":"xorg-server-hwe-16.04","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xorg-server-hwe-16.04","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xorg-server-hwe-18.04","name":"xorg-server-hwe-18.04","label":"xorg-server-hwe-18.04","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xorg-server-hwe-18.04","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xwayland","name":"xwayland","label":"xwayland","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xwayland","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"redhat","product":"enterprise_linux","name":"enterprise linux","label":"enterprise_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"6.0","noFixRecorded":false,"fixedIn":null},{"text":"7.0","noFixRecorded":false,"fixedIn":null},{"text":"8.0","noFixRecorded":false,"fixedIn":null},{"text":"9.0","noFixRecorded":false,"fixedIn":null},{"text":"10.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"6.0 | 7.0 | 8.0 | 9.0 | 10.0","eol":{"isEol":true,"eolDate":"2020-11-30T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"6","label":"6 (ELS)","eolFrom":"2020-11-30T00:00:00.000Z","isLts":true,"isMaintained":false,"latestVersion":"6.10"},"product":{"name":"rhel","label":"Red Hat Enterprise Linux","category":"os"}},"hubHref":"/vendor/redhat/enterprise_linux"},{"vendor":"x.org","product":"x_server","name":"x server","label":"x_server","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"na","noFixRecorded":false,"fixedIn":null}],"versionsText":"na","eol":null,"hubHref":"/vendor/xorg/x_server"}],"affectedCount":10,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:20547","label":"access.redhat.com/errata/RHSA-2026:20547","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20555","label":"access.redhat.com/errata/RHSA-2026:20555","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20557","label":"access.redhat.com/errata/RHSA-2026:20557","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20558","label":"access.redhat.com/errata/RHSA-2026:20558","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20560","label":"access.redhat.com/errata/RHSA-2026:20560","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20561","label":"access.redhat.com/errata/RHSA-2026:20561","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20562","label":"access.redhat.com/errata/RHSA-2026:20562","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20563","label":"access.redhat.com/errata/RHSA-2026:20563","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20575","label":"access.redhat.com/errata/RHSA-2026:20575","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20576","label":"access.redhat.com/errata/RHSA-2026:20576","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:20590","label":"access.redhat.com/errata/RHSA-2026:20590","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21699","label":"access.redhat.com/errata/RHSA-2026:21699","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21712","label":"access.redhat.com/errata/RHSA-2026:21712","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21715","label":"access.redhat.com/errata/RHSA-2026:21715","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21716","label":"access.redhat.com/errata/RHSA-2026:21716","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21718","label":"access.redhat.com/errata/RHSA-2026:21718","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21741","label":"access.redhat.com/errata/RHSA-2026:21741","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:21742","label":"access.redhat.com/errata/RHSA-2026:21742","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:22424","label":"access.redhat.com/errata/RHSA-2026:22424","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:22456","label":"access.redhat.com/errata/RHSA-2026:22456","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:23254","label":"access.redhat.com/errata/RHSA-2026:23254","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:23255","label":"access.redhat.com/errata/RHSA-2026:23255","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:23496","label":"access.redhat.com/errata/RHSA-2026:23496","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:24341","label":"access.redhat.com/errata/RHSA-2026:24341","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-34002","label":"access.redhat.com/security/cve/CVE-2026-34002","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT","Third Party Advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2451112","label":"bugzilla.redhat.com/show_bug.cgi?id=2451112","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-34002","label":"ubuntu.com/security/CVE-2026-34002","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-34002","label":"www.cve.org/CVERecord?id=CVE-2026-34002","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://lists.x.org/archives/xorg-announce/2026-April/003677.html","label":"lists.x.org/archives/xorg-announce/2026-April/003677.html","hostname":"lists.x.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-34002","label":"security-tracker.debian.org/tracker/CVE-2026-34002","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["MGASA-2026-0155","OPENSUSE-SU-2026:10556-1","OPENSUSE-SU-2026:10557-1","OPENSUSE-SU-2026:20544-1","OPENSUSE-SU-2026:20560-1","RHSA-2026:20547","RHSA-2026:20555","RHSA-2026:20557","RHSA-2026:20558","RHSA-2026:20560","RHSA-2026:20561","RHSA-2026:20562","RHSA-2026:20563","RHSA-2026:20575","RHSA-2026:20576","RHSA-2026:20590","RHSA-2026:21699","RHSA-2026:21712","RHSA-2026:21715","RHSA-2026:21716","RHSA-2026:21718","RHSA-2026:21741","RHSA-2026:21742","RHSA-2026:22424","RHSA-2026:22456","RHSA-2026:23254","RHSA-2026:23255","RHSA-2026:23496","RHSA-2026:24341","SUSE-SU-2026:1328-1","SUSE-SU-2026:1329-1","SUSE-SU-2026:1330-1","SUSE-SU-2026:1331-1","SUSE-SU-2026:1332-1","SUSE-SU-2026:1333-1","SUSE-SU-2026:1335-1","SUSE-SU-2026:21211-1"],"duplicates":[],"related":["CGA-PR6X-RVP5-3VR3","OPENSUSE-SU-2026:10556-1","OPENSUSE-SU-2026:10557-1","OPENSUSE-SU-2026:20544-1","OPENSUSE-SU-2026:20560-1","SUSE-SU-2026:1328-1","SUSE-SU-2026:1329-1","SUSE-SU-2026:1330-1","SUSE-SU-2026:1331-1","SUSE-SU-2026:1332-1","SUSE-SU-2026:1333-1","SUSE-SU-2026:1335-1","SUSE-SU-2026:21211-1"]},"timeline":[{"kind":"published","date":"2026-05-05T14:41:10.065Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-08T03:30:19.183Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T15:29:13.857Z","stale":false,"partial":false}}