{"id":"USN-8344-2","aliases":[],"status":"published","title":"python-pip regression","description":"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)","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2026-05-29T19:53:25Z","modified":"2026-05-29T23:29:14Z","fixes":[{"ecosystem":"Ubuntu:Pro:22.04:LTS","package":"python-pip","fixed_in":["22.0.2+dfsg-1ubuntu0.7+esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:24.04:LTS","package":"python-pip","fixed_in":["24.0+dfsg-1ubuntu1.3+esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:26.04:LTS","package":"python-pip","fixed_in":["25.1.1+dfsg-1ubuntu2+esm2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"python-pip","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"python-pip","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"python-pip","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"]}],"references":[{"url":"https://ubuntu.com/security/notices/USN-8344-2","tags":["advisory"]},{"url":"https://launchpad.net/bugs/2154576","tags":["report"]}],"sources":{"osv":[{"id":"USN-8344-2","title":"python-pip regression","description":"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)","status":"published","published":"2026-05-29T19:53:25Z","modified":"2026-05-29T23:29:14.707811205Z","updated_at":"2026-11-02T16:58:25.103481Z"}]}}