{"id":"USN-7927-1","summary":"python-urllib3 vulnerabilities","details":"Illia Volochii discovered that urllib3 did not limit the steps in a\ndecompression chain. An attacker could possibly use this issue to cause\nurllib3 to use excessive resources, causing a denial of service.\n(CVE-2025-66418)\n\nRui Xi discovered that urllib3 incorrectly handled highly compressed data.\nAn attacker could possibly use this issue to cause urllib3 to use excessive\nresources, causing a denial of service. This issue only affected Ubuntu\n24.04 LTS, Ubuntu 25.04, and Ubuntu 25.10. (CVE-2025-66471)\n\nFor the brotli encoding, the fix for CVE-2025-66471 requires an additional\nsecurity update in the brotli package.","modified":"2026-04-27T17:54:18.904490Z","published":"2025-12-11T15:15:13Z","related":["UBUNTU-CVE-2025-66418","UBUNTU-CVE-2025-66471"],"upstream":["CVE-2025-66418","CVE-2025-66471","UBUNTU-CVE-2025-66418","UBUNTU-CVE-2025-66471"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7927-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-66418"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-66471"}],"affected":[{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3@1.25.8-2ubuntu0.4+esm2?arch=source&distro=esm-infra/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.25.8-2ubuntu0.4+esm2"}]}],"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"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"python3-urllib3","binary_version":"1.25.8-2ubuntu0.4+esm2"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-66418","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"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7927-1.json"}},{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3@1.26.5-1~exp1ubuntu0.4?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.5-1~exp1ubuntu0.4"}]}],"versions":["1.26.5-1~exp1","1.26.5-1~exp1ubuntu0.1","1.26.5-1~exp1ubuntu0.2","1.26.5-1~exp1ubuntu0.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-urllib3","binary_version":"1.26.5-1~exp1ubuntu0.4"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-66418","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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7927-1.json"}},{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/python-urllib3@2.0.7-1ubuntu0.3?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.7-1ubuntu0.3"}]}],"versions":["1.26.16-1","1.26.18-1","2.0.7-1","2.0.7-1ubuntu0.1","2.0.7-1ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-urllib3","binary_version":"2.0.7-1ubuntu0.3"}],"availability":"No subscription required"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-66418","severity":[{"type":"CVSS_V4","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"},{"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-2025-66471","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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:24.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7927-1.json"}},{"package":{"name":"python-urllib3","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/python-urllib3@2.3.0-3ubuntu0.1?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-3ubuntu0.1"}]}],"versions":["2.3.0-2","2.3.0-2ubuntu1","2.3.0-3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"python3-urllib3","binary_version":"2.3.0-3ubuntu0.1"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2025-66418","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"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2025-66471","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"}]}],"ecosystem":"Ubuntu:25.10"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7927-1.json"}}],"schema_version":"1.7.5"}