{"schemaVersion":3,"id":"USN-8463-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"libvncserver vulnerabilities\n\nIt was discovered that LibVNCServer had a memory leak in the client cleanup\nfunction. An attacker could possibly use this issue to cause LibVNCServer\nto consume memory, leading to a denial of service. This issue only affected\nUbuntu 22.04 LTS. (CVE-2020-29260)\n\nIt was discovered that LibVNCServer did not properly validate bounds when\nhandling UltraZip encoding subrectangles. A remote attacker could possibly\nuse this issue to obtain sensitive information or cause a denial of\nservice. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and\nUbuntu 25.04. (CVE-2026-32853)\n\nIt was discovered that LibVNCServer did not properly validate return values\nin the HTTP proxy handlers. A remote attacker could possibly use this issue\nto cause LibVNCServer to crash, resulting in a denial of service. This\nissue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.04.\n(CVE-2026-32854)\n\nIt was discovered that LibVNCServer did not properly handle Tight encoding\ngradient filter rectangles. A remote attacker could use this issue to cause\nLibVNCServer to crash, resulting in a denial of service, or possibly\nexecute arbitrary code. (CVE-2026-44988)","dates":{"published":"2026-06-23T14:46:54.000Z","modified":"2026-06-23T22:14:21.491Z","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":"libvncserver","name":"libvncserver","label":"libvncserver","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libvncserver","purlType":"deb","versions":[{"text":"< 0.9.13+dfsg-3ubuntu0.1","noFixRecorded":false,"fixedIn":null},{"text":"< 0.9.14+dfsg-1ubuntu0.1","noFixRecorded":false,"fixedIn":null},{"text":"< 0.9.15+dfsg-1ubuntu0.1","noFixRecorded":false,"fixedIn":null},{"text":"< 0.9.15+dfsg-3ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.9.13+dfsg-3ubuntu0.1 | < 0.9.14+dfsg-1ubuntu0.1 | < 0.9.15+dfsg-1ubuntu0.1 | < 0.9.15+dfsg-3ubuntu0.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8463-1","label":"ubuntu.com/security/notices/USN-8463-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-29260","label":"ubuntu.com/security/CVE-2020-29260","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-32853","label":"ubuntu.com/security/CVE-2026-32853","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-32854","label":"ubuntu.com/security/CVE-2026-32854","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-44988","label":"ubuntu.com/security/CVE-2026-44988","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2020-29260","CVE-2026-32853","CVE-2026-32854","CVE-2026-44988"],"downstream":[],"duplicates":[],"related":["CVE-2020-29260","CVE-2026-32853","CVE-2026-32854","CVE-2026-44988"]},"timeline":[{"kind":"published","date":"2026-06-23T14:46:54.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-23T22:14:21.491Z","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":"2026-10-19T18:35:32.714Z","stale":false,"partial":false}}