{"id":"USN-8549-1","summary":"python-idna vulnerability","details":"It was discovered that idna did not properly reject oversized inputs before\nperforming expensive processing. An attacker could possibly use this issue\nto cause idna to consume significant resources, leading to a denial of\nservice.","modified":"2026-07-15T20:00:50.330418338Z","published":"2026-07-15T13:46:50Z","related":["UBUNTU-CVE-2026-45409"],"upstream":["CVE-2026-45409","UBUNTU-CVE-2026-45409"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8549-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-45409"}],"affected":[{"package":{"name":"python-idna","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/python-idna?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.3-1ubuntu0.2"}]}],"versions":["2.10-1","3.2-2","3.3-1","3.3-1ubuntu0.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"3.3-1ubuntu0.2","binary_name":"python3-idna"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-45409"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8549-1.json"}},{"package":{"name":"python-idna","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/python-idna?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6-2ubuntu0.2"}]}],"versions":["3.3-2","3.6-2","3.6-2ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-idna","binary_version":"3.6-2ubuntu0.2"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-45409","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:24.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8549-1.json"}},{"package":{"name":"python-idna","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-idna?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.11-1ubuntu0.1"}]}],"versions":["3.10-1","3.10-1build1","3.11-1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.11-1ubuntu0.1","binary_name":"python3-idna"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:26.04:LTS","cves":[{"id":"CVE-2026-45409","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8549-1.json"}}],"schema_version":"1.7.5"}