{"schemaVersion":3,"id":"USN-7694-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"libxml2 vulnerabilities\n\nAhmed Lekssays discovered that libxml2 did not properly perform certain\nmathematical operations, leading to an integer overflow. An attacker\ncould possibly use this issue to cause a crash, resulting in a denial of\nservice, or possibly execute arbitrary code. (CVE-2025-6021)\n\nAhmed Lekssays discovered that libxml2 did not properly validate the size\nof an untrusted input stream. An attacker could possibly use this issue\nto cause a crash, resulting in a denial of service, or possibly execute\narbitrary code. (CVE-2025-6170)\n\nNikita Sveshnikov discovered that libxml2 did not properly handle certain\nXPath expressions, leading to a use-after-free vulnerability. An attacker\ncould potentially exploit this issue to cause a denial of service.\n(CVE-2025-49794)\n\nNikita Sveshnikov discovered that libxml2 contained a type confusion\nvulnerability when parsing specially crafted XML documents. An attacker\ncould potentially exploit this issue to cause a denial of service.\n(CVE-2025-49796)","dates":{"published":"2025-08-14T04:48:16.000Z","modified":"2026-06-25T13:32:30.716Z","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":"libxml2","name":"libxml2","label":"libxml2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libxml2","purlType":"deb","versions":[{"text":"< 2.9.1+dfsg1-3ubuntu4.13+esm8","noFixRecorded":false,"fixedIn":null},{"text":"< 2.9.3+dfsg1-1ubuntu0.7+esm9","noFixRecorded":false,"fixedIn":null},{"text":"< 2.9.4+dfsg1-6.1ubuntu1.9+esm4","noFixRecorded":false,"fixedIn":null},{"text":"< 2.9.10+dfsg-5ubuntu0.20.04.10+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.9.13+dfsg-1ubuntu0.8","noFixRecorded":false,"fixedIn":null},{"text":"< 2.9.14+dfsg-1.3ubuntu3.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.9.1+dfsg1-3ubuntu4.13+esm8 | < 2.9.3+dfsg1-1ubuntu0.7+esm9 | < 2.9.4+dfsg1-6.1ubuntu1.9+esm4 | < 2.9.10+dfsg-5ubuntu0.20.04.10+esm1 | < 2.9.13+dfsg-1ubuntu0.8 | < 2.9.14+dfsg-1.3ubuntu3.4","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-7694-1","label":"ubuntu.com/security/notices/USN-7694-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-6021","label":"ubuntu.com/security/CVE-2025-6021","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-6170","label":"ubuntu.com/security/CVE-2025-6170","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-49794","label":"ubuntu.com/security/CVE-2025-49794","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-49796","label":"ubuntu.com/security/CVE-2025-49796","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":["CVE-2025-49794","CVE-2025-49796","CVE-2025-6021","CVE-2025-6170"],"downstream":[],"duplicates":[],"related":["CVE-2025-49794","CVE-2025-49796","CVE-2025-6021","CVE-2025-6170"]},"timeline":[{"kind":"published","date":"2025-08-14T04:48:16.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-25T13:32:30.716Z","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":"2026-10-19T19:31:18.470Z","stale":false,"partial":false}}