{"schemaVersion":3,"id":"CVE-2026-88806","aliases":["SUSE-SU-2026:23885-1","SUSE-SU-2026:23899-1","UBUNTU-CVE-2026-88806","DEBIAN-CVE-2026-88806","openSUSE-SU-2026:11833-1","openSUSE-SU-2026:21908-1","ALPINE-CVE-2026-88806"],"status":"published","duplicateOf":null,"title":null,"description":"A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.","dates":{"published":"2026-09-21T13:42:12.700Z","modified":"2026-09-22T03:55:48.003Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":4.1,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":4.1,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Alpine","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":4.1,"impact":9.8,"computed":true}]},"epss":{"probability":0.00199,"percentile":0.09146,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-09-22T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00199,"percentile":0.09146}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00199,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00199,"percentile":0.09146}]},"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-122","name":"Heap-based Buffer Overflow","description":"A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/122.html"}],"affected":[{"vendor":"alpine","product":"libx11","name":"libx11","label":"libx11","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/libx11","purlType":"apk","versions":[{"text":"< 1.8.14-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.14-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"libx11","name":"libx11","label":"libx11","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/libx11","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libx11","name":"libx11","label":"libx11","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libx11","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2:1.6.2-1ubuntu2.1+esm6","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.6.3-1ubuntu2.2+esm5","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.6.4-3ubuntu0.4+esm3","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.6.9-2ubuntu1.6+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.7.5-1ubuntu0.4","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.8.7-1ubuntu0.1","noFixRecorded":false,"fixedIn":null},{"text":"< 2:1.8.13-1ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2:1.6.2-1ubuntu2.1+esm6 | < 2:1.6.3-1ubuntu2.2+esm5 | < 2:1.6.4-3ubuntu0.4+esm3 | < 2:1.6.9-2ubuntu1.6+esm1 | < 2:1.7.5-1ubuntu0.4 | < 2:1.8.7-1ubuntu0.1 | < 2:1.8.13-1ubuntu0.1","eol":null,"hubHref":null},{"vendor":"opensuse","product":"libX11&distro=openSUSE Leap 16.0","name":"libX11","label":"libX11&distro=openSUSE Leap 16.0","ecosystem":"openSUSE","cpePart":null,"purl":"pkg:rpm/opensuse/libX11&distro=openSUSE Leap 16.0","purlType":"rpm","versions":[{"text":"< 1.8.10-160000.4.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.10-160000.4.1","eol":null,"hubHref":null},{"vendor":"opensuse","product":"libX11&distro=openSUSE Tumbleweed","name":"libX11","label":"libX11&distro=openSUSE Tumbleweed","ecosystem":"openSUSE","cpePart":null,"purl":"pkg:rpm/opensuse/libX11&distro=openSUSE Tumbleweed","purlType":"rpm","versions":[{"text":"< 1.8.13-2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.13-2.1","eol":null,"hubHref":null},{"vendor":"suse","product":"libX11&distro=SUSE Linux Enterprise Server 16.0","name":"libX11","label":"libX11&distro=SUSE Linux Enterprise Server 16.0","ecosystem":"SUSE Linux Enterprise","cpePart":null,"purl":"pkg:rpm/suse/libX11&distro=SUSE Linux Enterprise Server 16.0","purlType":"rpm","versions":[{"text":"< 1.8.10-160000.4.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.10-160000.4.1","eol":null,"hubHref":null},{"vendor":"suse","product":"libX11&distro=SUSE Linux Enterprise Server for SAP applications 16.0","name":"libX11","label":"libX11&distro=SUSE Linux Enterprise Server for SAP applications 16.0","ecosystem":"SUSE Linux Enterprise","cpePart":null,"purl":"pkg:rpm/suse/libX11&distro=SUSE Linux Enterprise Server for SAP applications 16.0","purlType":"rpm","versions":[{"text":"< 1.8.10-160000.4.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.10-160000.4.1","eol":null,"hubHref":null},{"vendor":"suse","product":"libX11&distro=SUSE Linux Micro 6.2","name":"libX11","label":"libX11&distro=SUSE Linux Micro 6.2","ecosystem":"SUSE Linux Enterprise","cpePart":null,"purl":"pkg:rpm/suse/libX11&distro=SUSE Linux Micro 6.2","purlType":"rpm","versions":[{"text":"< 1.8.10-160000.4.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.10-160000.4.1","eol":null,"hubHref":null},{"vendor":"x.org","product":"libx11","name":"libx11","label":"libx11","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 1.8.14","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.8.14","eol":null,"hubHref":"/vendor/xorg/libx11"}],"affectedCount":9,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/309","label":"gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/309","hostname":"gitlab.freedesktop.org","tags":["Patch","REPORT"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623885-1/","label":"www.suse.com/support/update/announcement/2026/suse-su-202623885-1/","hostname":"www.suse.com","tags":["Advisory"]},{"url":"https://bugzilla.suse.com/1280910","label":"bugzilla.suse.com/1280910","hostname":"bugzilla.suse.com","tags":["REPORT"]},{"url":"https://www.suse.com/security/cve/CVE-2026-88806","label":"www.suse.com/security/cve/CVE-2026-88806","hostname":"www.suse.com","tags":["WEB"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623899-1/","label":"www.suse.com/support/update/announcement/2026/suse-su-202623899-1/","hostname":"www.suse.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-88806","label":"ubuntu.com/security/CVE-2026-88806","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-88806","label":"www.cve.org/CVERecord?id=CVE-2026-88806","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-88806","label":"security-tracker.debian.org/tracker/CVE-2026-88806","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://ubuntu.com/security/notices/USN-8913-1","label":"ubuntu.com/security/notices/USN-8913-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-88806","label":"security.alpinelinux.org/vuln/CVE-2026-88806","hostname":"security.alpinelinux.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["MGASA-2026-0508","SUSE-SU-2026:4410-1","SUSE-SU-2026:4500-1","SUSE-SU-2026:4501-1","SUSE-SU-2026:4502-1","USN-8913-1"],"duplicates":[],"related":["SUSE-SU-2026:4410-1","SUSE-SU-2026:4500-1","SUSE-SU-2026:4501-1","SUSE-SU-2026:4502-1","USN-8913-1"]},"timeline":[{"kind":"published","date":"2026-09-21T13:42:12.700Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-22T03:55:48.003Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T04:08:23.384Z","stale":false,"partial":false}}