{"id":"USN-7955-1","summary":"python-urllib3 vulnerability","details":"It was discovered that urllib3 incorrectly handled decompression during\nHTTP redirects. An attacker could possibly use this issue to cause urllib3\nto use excessive resources, causing a denial of service.","modified":"2026-04-27T18:33:20.049664Z","published":"2026-01-12T15:31:10Z","related":["UBUNTU-CVE-2026-21441"],"upstream":["CVE-2026-21441","UBUNTU-CVE-2026-21441"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7955-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-21441"}],"affected":[{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3@1.25.8-2ubuntu0.4+esm3?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.25.8-2ubuntu0.4+esm3"}]}],"versions":["1.24.1-1ubuntu1","1.24.1-1ubuntu2","1.25.8-1","1.25.8-2","1.25.8-2ubuntu0.1","1.25.8-2ubuntu0.2","1.25.8-2ubuntu0.3","1.25.8-2ubuntu0.4","1.25.8-2ubuntu0.4+esm1","1.25.8-2ubuntu0.4+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.25.8-2ubuntu0.4+esm3","binary_name":"python3-urllib3"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7955-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-21441"}]}}},{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3@1.26.5-1~exp1ubuntu0.5?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.5-1~exp1ubuntu0.5"}]}],"versions":["1.26.5-1~exp1","1.26.5-1~exp1ubuntu0.1","1.26.5-1~exp1ubuntu0.2","1.26.5-1~exp1ubuntu0.3","1.26.5-1~exp1ubuntu0.4"],"ecosystem_specific":{"binaries":[{"binary_version":"1.26.5-1~exp1ubuntu0.5","binary_name":"python3-urllib3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7955-1.json","cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-21441"}]}}},{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3@2.0.7-1ubuntu0.4?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.7-1ubuntu0.4"}]}],"versions":["1.26.16-1","1.26.18-1","2.0.7-1","2.0.7-1ubuntu0.1","2.0.7-1ubuntu0.2","2.0.7-1ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.7-1ubuntu0.4","binary_name":"python3-urllib3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7955-1.json","cves_map":{"ecosystem":"Ubuntu:24.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-21441"}]}}},{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/python-urllib3@2.3.0-3ubuntu0.2?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-3ubuntu0.2"}]}],"versions":["2.3.0-2","2.3.0-2ubuntu1","2.3.0-3","2.3.0-3ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.0-3ubuntu0.2","binary_name":"python3-urllib3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7955-1.json","cves_map":{"ecosystem":"Ubuntu:25.10","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-21441"}]}}}],"schema_version":"1.7.5"}