{"schemaVersion":3,"id":"USN-8813-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"expat vulnerabilities\n\nIt was discovered that Expat did not correctly handle certain integer\narithmetic. An attacker could possibly use this issue to cause a denial of\nservice.\n(CVE-2026-56406, CVE-2026-56407, CVE-2026-56409, CVE-2026-56410, CVE-2026-56411)\n\nIt was discovered that Expat did not correctly track handler call depth. An\nattacker could possibly use this issue to cause Expat to crash or execute\narbitrary code. (CVE-2026-56131)\n\nIt was discovered that Expat did not correctly handle certain memory\noperations. An attacker could possibly use this issue to cause Expat to\ncrash or execute arbitrary code. (CVE-2026-56132)\n\nIt was discovered that Expat did not correctly handle certain Unicode\ncharacters. An attacker could possibly use this issue to cause Expat to use\nexcessive resources, leading to a denial of service. (CVE-2026-72522)\n\nIt was discovered that Expat did not correctly process certain XML\nattributes. A remote attacker could possibly use this issue to cause Expat\nto use excessive resources, leading to a denial of service.\n(CVE-2026-66046)\n\nIt was discovered that Expat did not correctly handle certain external\nentities. An attacker could possibly use this issue to cause Expat to crash\nor execute arbitrary code. (CVE-2026-76641)\n\nIt was discovered that Expat did not correctly track handler call depth\nwith custom encodings. An attacker could possibly use this issue to cause\nExpat to crash or execute arbitrary code. (CVE-2026-76957)","dates":{"published":"2026-09-24T12:45:19.000Z","modified":"2026-09-25T00:43:11.198Z","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+esm13","noFixRecorded":false,"fixedIn":null},{"text":"< 2.1.0-7ubuntu0.16.04.5+esm14","noFixRecorded":false,"fixedIn":null},{"text":"< 2.2.5-3ubuntu0.9+esm5","noFixRecorded":false,"fixedIn":null},{"text":"< 2.2.9-1ubuntu0.8+esm3","noFixRecorded":false,"fixedIn":null},{"text":"< 2.4.7-1ubuntu0.9","noFixRecorded":false,"fixedIn":null},{"text":"< 2.6.1-2ubuntu0.6","noFixRecorded":false,"fixedIn":null},{"text":"< 2.7.4-1ubuntu0.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.1.0-4ubuntu1.4+esm13 | < 2.1.0-7ubuntu0.16.04.5+esm14 | < 2.2.5-3ubuntu0.9+esm5 | < 2.2.9-1ubuntu0.8+esm3 | < 2.4.7-1ubuntu0.9 | < 2.6.1-2ubuntu0.6 | < 2.7.4-1ubuntu0.2","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8813-1","label":"ubuntu.com/security/notices/USN-8813-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-56131","label":"ubuntu.com/security/CVE-2026-56131","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56132","label":"ubuntu.com/security/CVE-2026-56132","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56406","label":"ubuntu.com/security/CVE-2026-56406","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56407","label":"ubuntu.com/security/CVE-2026-56407","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56409","label":"ubuntu.com/security/CVE-2026-56409","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56410","label":"ubuntu.com/security/CVE-2026-56410","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-56411","label":"ubuntu.com/security/CVE-2026-56411","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-66046","label":"ubuntu.com/security/CVE-2026-66046","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-72522","label":"ubuntu.com/security/CVE-2026-72522","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-76641","label":"ubuntu.com/security/CVE-2026-76641","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-76957","label":"ubuntu.com/security/CVE-2026-76957","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2026-56131","CVE-2026-56132","CVE-2026-56406","CVE-2026-56407","CVE-2026-56409","CVE-2026-56410","CVE-2026-56411","CVE-2026-66046","CVE-2026-72522","CVE-2026-76641","CVE-2026-76957"],"downstream":[],"duplicates":[],"related":["CVE-2026-56131","CVE-2026-56132","CVE-2026-56406","CVE-2026-56407","CVE-2026-56409","CVE-2026-56410","CVE-2026-56411","CVE-2026-66046","CVE-2026-72522","CVE-2026-76641","CVE-2026-76957"]},"timeline":[{"kind":"published","date":"2026-09-24T12:45:19.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-25T00:43:11.198Z","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":"2026-10-20T15:33:54.163Z","stale":false,"partial":false}}