{"id":"USN-8811-1","summary":"python-urllib3 vulnerability","details":"It was discovered that urllib3 did not correctly strip sensitive HTTP\nheaders during cross-origin redirects. An attacker could possibly use this\nissue to leak sensitive information.","modified":"2026-09-24T13:12:30.228984570Z","published":"2026-09-24T01:39:52Z","related":["UBUNTU-CVE-2026-44431"],"upstream":["CVE-2026-44431","UBUNTU-CVE-2026-44431"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8811-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-44431"}],"affected":[{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.13.1-2ubuntu0.16.04.4+esm4"}]}],"versions":["1.11-1","1.12-1","1.13.1-1","1.13.1-2","1.13.1-2ubuntu0.16.04.1","1.13.1-2ubuntu0.16.04.2","1.13.1-2ubuntu0.16.04.3","1.13.1-2ubuntu0.16.04.4","1.13.1-2ubuntu0.16.04.4+esm1","1.13.1-2ubuntu0.16.04.4+esm2","1.13.1-2ubuntu0.16.04.4+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"python-urllib3","binary_version":"1.13.1-2ubuntu0.16.04.4+esm4"},{"binary_name":"python3-urllib3","binary_version":"1.13.1-2ubuntu0.16.04.4+esm4"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8811-1.json","cves_map":{"cves":[{"id":"CVE-2026-44431","severity":[{"score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.22-1ubuntu0.18.04.2+esm4"}]}],"versions":["1.21.1-1","1.22-1","1.22-1ubuntu0.18.04.1","1.22-1ubuntu0.18.04.2","1.22-1ubuntu0.18.04.2+esm1","1.22-1ubuntu0.18.04.2+esm2","1.22-1ubuntu0.18.04.2+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.22-1ubuntu0.18.04.2+esm4","binary_name":"python-urllib3"},{"binary_name":"python3-urllib3","binary_version":"1.22-1ubuntu0.18.04.2+esm4"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-44431","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8811-1.json"}},{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.25.8-2ubuntu0.4+esm5"}]}],"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","1.25.8-2ubuntu0.4+esm3","1.25.8-2ubuntu0.4+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-urllib3","binary_version":"1.25.8-2ubuntu0.4+esm5"}],"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-8811-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/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:L/I:N/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-44431"}]}}}],"schema_version":"1.9.0"}