{"id":"USN-8344-2","summary":"python-pip regression","details":"USN-8344-1 fixed vulnerabilities in pip. On Ubuntu 22.04 LTS, Ubuntu 24.04 LTS,\nand Ubuntu 26.04 LTS the patches for CVE-2025-66471 caused a regression when\nusing pip. The patches for CVE-2025-66471 have been temporarily reverted\npending investigation.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that pip incorrectly handled TLS certificate\n verification in session connections. If a session was first used with\n certificate verification disabled, subsequent requests to the same host\n would also skip verification regardless of the session's current settings.\n A remote attacker could possibly use this issue to perform a machine-in-the-middle\n attack and expose sensitive information. (CVE-2024-35195)\n\n It was discovered that pip's bundled urllib3 library did not limit the\n number of decompression steps when processing HTTP responses. A remote\n attacker could possibly use this issue to cause pip to consume excessive resources,\n leading to a denial of service. (CVE-2025-66418)\n\n It was discovered that pip's bundled urllib3 library improperly\n handled streaming decompression of highly compressed data. A remote\n attacker could possibly use this issue to cause pip to consume excessive resources,\n leading to a denial of service. (CVE-2025-66471)","modified":"2026-05-29T23:29:14.707811205Z","published":"2026-05-29T19:53:25Z","related":["UBUNTU-CVE-2025-66471"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8344-2"},{"type":"REPORT","url":"https://launchpad.net/bugs/2154576"}],"affected":[{"package":{"name":"python-pip","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/python-pip?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"22.0.2+dfsg-1ubuntu0.7+esm2"}]}],"versions":["20.3.4-4","21.3.1+dfsg-3","22.0.2+dfsg-1","22.0.2+dfsg-1ubuntu0.1","22.0.2+dfsg-1ubuntu0.2","22.0.2+dfsg-1ubuntu0.3","22.0.2+dfsg-1ubuntu0.4","22.0.2+dfsg-1ubuntu0.5","22.0.2+dfsg-1ubuntu0.6","22.0.2+dfsg-1ubuntu0.7","22.0.2+dfsg-1ubuntu0.7+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"python3-pip","binary_version":"22.0.2+dfsg-1ubuntu0.7+esm2"},{"binary_name":"python3-pip-whl","binary_version":"22.0.2+dfsg-1ubuntu0.7+esm2"}]},"database_specific":{"cves_map":{"cves":[],"ecosystem":"Ubuntu:Pro:22.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8344-2.json"}},{"package":{"name":"python-pip","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/python-pip?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"24.0+dfsg-1ubuntu1.3+esm2"}]}],"versions":["23.2+dfsg-1","23.3+dfsg-1","24.0+dfsg-1","24.0+dfsg-1ubuntu1","24.0+dfsg-1ubuntu1.1","24.0+dfsg-1ubuntu1.2","24.0+dfsg-1ubuntu1.3","24.0+dfsg-1ubuntu1.3+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"python3-pip","binary_version":"24.0+dfsg-1ubuntu1.3+esm2"},{"binary_name":"python3-pip-whl","binary_version":"24.0+dfsg-1ubuntu1.3+esm2"}]},"database_specific":{"cves_map":{"cves":[],"ecosystem":"Ubuntu:Pro:24.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8344-2.json"}},{"package":{"name":"python-pip","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/python-pip?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"25.1.1+dfsg-1ubuntu2+esm2"}]}],"versions":["25.1.1+dfsg-1ubuntu2","25.1.1+dfsg-1ubuntu2+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"python3-pip","binary_version":"25.1.1+dfsg-1ubuntu2+esm2"},{"binary_name":"python3-pip-whl","binary_version":"25.1.1+dfsg-1ubuntu2+esm2"}]},"database_specific":{"cves_map":{"cves":[],"ecosystem":"Ubuntu:Pro:26.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8344-2.json"}}],"schema_version":"1.7.5"}