{"schemaVersion":3,"id":"USN-8560-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"libxfont vulnerabilities\n\nIt was discovered that libXfont incorrectly handled scaling bitmap\nfonts, leading to a heap buffer overflow. An attacker able to access\nthe X server could use this issue to cause libXfont to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2026-56001)\n\nIt was discovered that libXfont did not properly check glyph bounds\nwhen reading PCF fonts, leading to a heap buffer overflow. An\nauthenticated X client could use this issue to cause libXfont to\ncrash, resulting in a denial of service, or possibly execute arbitrary\ncode. (CVE-2026-56002)\n\nIt was discovered that libXfont did not properly check the size of the\nproperty buffer when parsing PCF fonts, leading to a heap buffer\noverflow. An authenticated X client could use this issue to cause\nlibXfont to crash, resulting in a denial of service, or possibly\nexecute arbitrary code. (CVE-2026-56003)","dates":{"published":"2026-07-20T12:28:31.000Z","modified":"2026-07-21T13:20:11.018Z","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":"libxfont","name":"libxfont","label":"libxfont","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libxfont","purlType":"deb","versions":[{"text":"< 1:1.4.7-1ubuntu0.4+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:1.5.1-1ubuntu0.16.04.4+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.3-1ubuntu0.1~esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.3-1ubuntu0.20.04.1~esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.5-1ubuntu0.2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.6-1+deb13u1build0.24.04.2","noFixRecorded":false,"fixedIn":null},{"text":"< 1:2.0.6-2ubuntu0.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1:1.4.7-1ubuntu0.4+esm2 | < 1:1.5.1-1ubuntu0.16.04.4+esm2 | < 1:2.0.3-1ubuntu0.1~esm2 | < 1:2.0.3-1ubuntu0.20.04.1~esm2 | < 1:2.0.5-1ubuntu0.2 | < 1:2.0.6-1+deb13u1build0.24.04.2 | < 1:2.0.6-2ubuntu0.2","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8560-1","label":"ubuntu.com/security/notices/USN-8560-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2017-16611","label":"ubuntu.com/security/CVE-2017-16611","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56001","label":"ubuntu.com/security/CVE-2026-56001","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56002","label":"ubuntu.com/security/CVE-2026-56002","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56003","label":"ubuntu.com/security/CVE-2026-56003","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2017-16611","CVE-2026-56001","CVE-2026-56002","CVE-2026-56003"],"downstream":[],"duplicates":[],"related":["CVE-2026-56001","CVE-2026-56002","CVE-2026-56003"]},"timeline":[{"kind":"published","date":"2026-07-20T12:28:31.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-21T13:20:11.018Z","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":"2026-10-20T03:11:43.055Z","stale":false,"partial":false}}