{"schemaVersion":3,"id":"USN-8790-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"expat vulnerabilities\n\nIt was discovered that Expat could be made to allocate large amounts of\nmemory when parsing a small crafted document. An attacker could possibly\nuse this issue to cause Expat to consume resources, leading to a denial of\nservice. This issue was only addressed in Ubuntu 24.04 LTS.\n(CVE-2025-59375)\n\nIt was discovered that Expat incorrectly handled empty external parameter\nentity content. An attacker could possibly use this issue to cause Expat to\ncrash, resulting in a denial of service. (CVE-2026-32776)\n\nIt was discovered that Expat incorrectly handled certain DTD content. An\nattacker could possibly use this issue to cause Expat to enter an infinite\nloop, resulting in a denial of service. (CVE-2026-32777)\n\nIt was discovered that Expat incorrectly handled memory when retrying after\nan earlier out-of-memory condition. An attacker could possibly use this\nissue to cause Expat to crash, resulting in a denial of service.\n(CVE-2026-32778)\n\nIt was discovered that Expat performed attribute name collision checks\ninefficiently. An attacker could possibly use this issue to cause Expat to\nconsume resources when processing a moderately sized crafted XML document,\nresulting in a denial of service.  This issue was only addressed in Ubuntu\n24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-45186)\n\nIt was discovered that Expat used insufficient entropy, allowing hash\nflooding through a crafted XML document. An attacker could possibly use\nthis issue to cause Expat to consume resources, leading to a denial of\nservice.  This issue was only addressed in Ubuntu 14.04 LTS, Ubuntu 24.04\nLTS, and Ubuntu 26.04 LTS. (CVE-2026-41080)\n\nIt was discovered that Expat did not track handler call depth for certain\nfunctions called from within handlers, leading to a use-after-free. An\nattacker could possibly use this issue to cause Expat to crash, resulting\nin a denial of service, or possibly execute arbitrary code.\n(CVE-2026-50219, CVE-2026-56412)\n\nIt was discovered that Expat incorrectly handled certain values, leading to\ninteger overflows. An attacker could possibly use this issue to cause Expat\nto crash, resulting in a denial of service. (CVE-2026-56403,\nCVE-2026-56404, CVE-2026-56405)\n\nIt was discovered that Expat incorrectly handled certain values, leading to\nan integer overflow. An attacker could possibly use this issue to cause\nExpat to crash, resulting in a denial of service. This issue only affected\nUbuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and\nUbuntu 26.04 LTS. (CVE-2026-56408)","dates":{"published":"2026-09-21T13:50:42.000Z","modified":"2026-09-22T03:27:36.575Z","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":"expat","name":"expat","label":"expat","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/expat","purlType":"deb","versions":[{"text":"< 2.1.0-4ubuntu1.4+esm12","noFixRecorded":false,"fixedIn":null},{"text":"< 2.1.0-7ubuntu0.16.04.5+esm13","noFixRecorded":false,"fixedIn":null},{"text":"< 2.2.5-3ubuntu0.9+esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 2.2.9-1ubuntu0.8+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 2.4.7-1ubuntu0.8","noFixRecorded":false,"fixedIn":null},{"text":"< 2.6.1-2ubuntu0.5","noFixRecorded":false,"fixedIn":null},{"text":"< 2.7.4-1ubuntu0.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.1.0-4ubuntu1.4+esm12 | < 2.1.0-7ubuntu0.16.04.5+esm13 | < 2.2.5-3ubuntu0.9+esm4 | < 2.2.9-1ubuntu0.8+esm2 | < 2.4.7-1ubuntu0.8 | < 2.6.1-2ubuntu0.5 | < 2.7.4-1ubuntu0.1","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8790-1","label":"ubuntu.com/security/notices/USN-8790-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-59375","label":"ubuntu.com/security/CVE-2025-59375","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-32776","label":"ubuntu.com/security/CVE-2026-32776","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-32777","label":"ubuntu.com/security/CVE-2026-32777","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-32778","label":"ubuntu.com/security/CVE-2026-32778","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-41080","label":"ubuntu.com/security/CVE-2026-41080","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-45186","label":"ubuntu.com/security/CVE-2026-45186","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-50219","label":"ubuntu.com/security/CVE-2026-50219","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56403","label":"ubuntu.com/security/CVE-2026-56403","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56404","label":"ubuntu.com/security/CVE-2026-56404","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56405","label":"ubuntu.com/security/CVE-2026-56405","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56408","label":"ubuntu.com/security/CVE-2026-56408","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56412","label":"ubuntu.com/security/CVE-2026-56412","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2025-59375","CVE-2026-32776","CVE-2026-32777","CVE-2026-32778","CVE-2026-41080","CVE-2026-45186","CVE-2026-50219","CVE-2026-56403","CVE-2026-56404","CVE-2026-56405","CVE-2026-56408","CVE-2026-56412"],"downstream":[],"duplicates":[],"related":["CVE-2025-59375","CVE-2026-32776","CVE-2026-32777","CVE-2026-32778","CVE-2026-41080","CVE-2026-45186","CVE-2026-50219","CVE-2026-56403","CVE-2026-56404","CVE-2026-56405","CVE-2026-56408","CVE-2026-56412"]},"timeline":[{"kind":"published","date":"2026-09-21T13:50:42.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-22T03:27:36.575Z","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":"2026-10-20T07:13:14.007Z","stale":false,"partial":false}}