{"schemaVersion":3,"id":"USN-8913-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"libx11 vulnerabilities\n\nAdam Bedard discovered that libx11 incorrectly handled certain XKB keyboard\nmap replies. If a user were tricked into connecting to a malicious X\nserver, a remote attacker could possibly use this issue to cause libx11 to\ncrash, resulting in a denial of service, or possibly execute arbitrary\ncode. (CVE-2026-88806)\n\nIt was discovered that libx11 incorrectly handled certain X Input Method\n(XIM) messages. If a user were tricked into connecting to a malicious X\nserver, a remote attacker could possibly use these issues to cause libx11\nto crash, resulting in a denial of service. (CVE-2026-94283,\nCVE-2026-94284)\n\nIt was discovered that libx11 incorrectly handled converting certain\nmultibyte text. An attacker could possibly use this issue to cause libx11\nto crash, resulting in a denial of service. (CVE-2026-94285)","dates":{"published":"2026-10-12T12:53:41.000Z","modified":"2026-10-12T20:28:09.464Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"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":[],"affected":[{"vendor":"ubuntu","product":"libx11","name":"libx11","label":"libx11","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libx11","purlType":"deb","versions":[{"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":"< 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}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8913-1","label":"ubuntu.com/security/notices/USN-8913-1","hostname":"ubuntu.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://ubuntu.com/security/CVE-2026-94283","label":"ubuntu.com/security/CVE-2026-94283","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-94284","label":"ubuntu.com/security/CVE-2026-94284","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-94285","label":"ubuntu.com/security/CVE-2026-94285","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2026-88806","CVE-2026-94283","CVE-2026-94284","CVE-2026-94285"],"downstream":[],"duplicates":[],"related":["CVE-2026-88806","CVE-2026-94283","CVE-2026-94284","CVE-2026-94285"]},"timeline":[{"kind":"published","date":"2026-10-12T12:53:41.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-12T20:28:09.464Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T10:33:31.126Z","stale":false,"partial":false}}