{"schemaVersion":3,"id":"USN-8018-2","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"python3.4, python3.5, python3.6, python3.7, python3.8, python3.9,\npython3.10, python3.11, python3.12, python3.13, python3.14 regression\n\nUSN-8018-1 fixed vulnerabilities in python3. That update introduced\nregressions.  The patches for CVE-2025-15366 and CVE-2025-15367 caused\nbehavior regressions in  IMAP and POP3 handling, which upstream chose to\navoid by not backporting them.  Additionally, the patch for CVE-2026-0865\nincorrectly rejected horizontal tabs in wsgiref headers. This update fixes\nthese problems.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Denis Ledoux discovered that Python incorrectly parsed email message\n headers. An attacker could possibly use this issue to inject arbitrary\n headers into email messages. This issue only affected python3.6,\n python3.7,  python3.8, python3.9, python3.10, python3.11, python3.12,\n python3.13, and  python3.14 packages. (CVE-2025-11468)\n\n Jacob Walls, Shai Berger, and Natalia Bidart discovered that Python\n inefficiently parsed XML input with quadratic complexity. An attacker\n could  possibly use this issue to cause a denial of service.\n (CVE-2025-12084)\n\n It was discovered that Python incorrectly parsed malicious plist files. An\n attacker could possibly use this issue to cause Python to use excessive\n resources, leading to a denial of service. This issue only affected\n python3.5, python3.6, python3.7, python3.8, python3.9, python3.10,\n python3.11, python3.12, python3.13, and python3.14 packages.\n (CVE-2025-13837)\n\n Omar Hasan discovered that Python incorrectly parsed URL mediatypes. An\n attacker could possibly use this issue to inject arbitrary HTTP headers.\n (CVE-2025-15282)\n\n Omar Hasan discovered that Python incorrectly parsed malicious IMAP\n inputs.  An attacker could possibly use this issue to inject arbitrary\n IMAP  commands. (CVE-2025-15366)\n\n Omar Hasan discovered that Python incorrectly parsed malicious POP3\n inputs.  An attacker could possibly use this issue to inject arbitrary\n POP3  commands. (CVE-2025-15367)\n\n Omar Hasan discovered that Python incorrectly parsed malicious HTTP cookie\n headers. An attacker could possibly use this issue to inject arbitrary\n HTTP  headers. (CVE-2026-0672)\n\n Omar Hasan discovered that Python incorrectly parsed malicious HTTP header\n names and values. An attacker could possibly use this issue to inject\n arbitrary HTTP headers. (CVE-2026-0865)","dates":{"published":"2026-03-09T09:24:18.000Z","modified":"2026-06-25T13:32:31.952Z","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":"python3.10","name":"python3.10","label":"python3.10","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.10","purlType":"deb","versions":[{"text":"< 3.10.12-1~22.04.15","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.10.12-1~22.04.15","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.11","name":"python3.11","label":"python3.11","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.11","purlType":"deb","versions":[{"text":"< 3.11.0~rc1-1~22.04.1~esm9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.11.0~rc1-1~22.04.1~esm9","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.12","name":"python3.12","label":"python3.12","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.12","purlType":"deb","versions":[{"text":"< 3.12.3-1ubuntu0.12","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.12.3-1ubuntu0.12","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.13","name":"python3.13","label":"python3.13","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.13","purlType":"deb","versions":[{"text":"< 3.13.7-1ubuntu0.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.13.7-1ubuntu0.4","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.14","name":"python3.14","label":"python3.14","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.14","purlType":"deb","versions":[{"text":"< 3.14.0-1ubuntu0.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.14.0-1ubuntu0.3","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.4","name":"python3.4","label":"python3.4","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.4","purlType":"deb","versions":[{"text":"< 3.4.3-1ubuntu1~14.04.7+esm20","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.4.3-1ubuntu1~14.04.7+esm20","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.5","name":"python3.5","label":"python3.5","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.5","purlType":"deb","versions":[{"text":"< 3.5.2-2ubuntu0~16.04.4~14.04.1+esm10","noFixRecorded":false,"fixedIn":null},{"text":"< 3.5.2-2ubuntu0~16.04.13+esm22","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.5.2-2ubuntu0~16.04.4~14.04.1+esm10 | < 3.5.2-2ubuntu0~16.04.13+esm22","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.6","name":"python3.6","label":"python3.6","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.6","purlType":"deb","versions":[{"text":"< 3.6.9-1~18.04ubuntu1.13+esm9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.6.9-1~18.04ubuntu1.13+esm9","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.7","name":"python3.7","label":"python3.7","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.7","purlType":"deb","versions":[{"text":"< 3.7.5-2ubuntu1~18.04.2+esm10","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.7.5-2ubuntu1~18.04.2+esm10","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.8","name":"python3.8","label":"python3.8","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.8","purlType":"deb","versions":[{"text":"< 3.8.0-3ubuntu1~18.04.2+esm10","noFixRecorded":false,"fixedIn":null},{"text":"< 3.8.10-0ubuntu1~20.04.18+esm6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.8.0-3ubuntu1~18.04.2+esm10 | < 3.8.10-0ubuntu1~20.04.18+esm6","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"python3.9","name":"python3.9","label":"python3.9","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/python3.9","purlType":"deb","versions":[{"text":"< 3.9.5-3ubuntu0~20.04.1+esm10","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.9.5-3ubuntu0~20.04.1+esm10","eol":null,"hubHref":null}],"affectedCount":11,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8018-2","label":"ubuntu.com/security/notices/USN-8018-2","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-15366","label":"ubuntu.com/security/CVE-2025-15366","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2025-15367","label":"ubuntu.com/security/CVE-2025-15367","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-0865","label":"ubuntu.com/security/CVE-2026-0865","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://bugs.launchpad.net/bugs/2143706","label":"bugs.launchpad.net/bugs/2143706","hostname":"bugs.launchpad.net","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":["CVE-2025-15366","CVE-2025-15367"]},"timeline":[{"kind":"published","date":"2026-03-09T09:24:18.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-25T13:32:31.952Z","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":"2026-10-19T22:37:50.669Z","stale":false,"partial":false}}