USN-8344-2

Vulnerability from osv_ubuntu – Published: 2026-05-29 19:53 – Updated: 2026-05-29 19:53 – Source website
VLAI
Summary
python-pip regression
Details

USN-8344-1 fixed vulnerabilities in pip. On Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS the patches for CVE-2025-66471 caused a regression when using pip. The patches for CVE-2025-66471 have been temporarily reverted pending investigation.

We apologize for the inconvenience.

Original advisory details:

It was discovered that pip incorrectly handled TLS certificate verification in session connections. If a session was first used with certificate verification disabled, subsequent requests to the same host would also skip verification regardless of the session's current settings. A remote attacker could possibly use this issue to perform a machine-in-the-middle attack and expose sensitive information. (CVE-2024-35195)

It was discovered that pip's bundled urllib3 library did not limit the number of decompression steps when processing HTTP responses. A remote attacker could possibly use this issue to cause pip to consume excessive resources, leading to a denial of service. (CVE-2025-66418)

It was discovered that pip's bundled urllib3 library improperly handled streaming decompression of highly compressed data. A remote attacker could possibly use this issue to cause pip to consume excessive resources, leading to a denial of service. (CVE-2025-66471)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:Pro:22.04:LTS"
        }
      },
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "python-pip",
        "purl": "pkg:deb/ubuntu/python-pip@22.0.2+dfsg-1ubuntu0.7+esm2?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "22.0.2+dfsg-1ubuntu0.7+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:Pro:24.04:LTS"
        }
      },
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "python-pip",
        "purl": "pkg:deb/ubuntu/python-pip@24.0+dfsg-1ubuntu1.3+esm2?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "24.0+dfsg-1ubuntu1.3+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:Pro:26.04:LTS"
        }
      },
      "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"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "python-pip",
        "purl": "pkg:deb/ubuntu/python-pip@25.1.1+dfsg-1ubuntu2+esm2?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "25.1.1+dfsg-1ubuntu2+esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "25.1.1+dfsg-1ubuntu2",
        "25.1.1+dfsg-1ubuntu2+esm1"
      ]
    }
  ],
  "aliases": [],
  "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\u0027s 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\u0027s 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\u0027s 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)",
  "id": "USN-8344-2",
  "modified": "2026-05-29T19:53:25Z",
  "published": "2026-05-29T19:53:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8344-2"
    },
    {
      "type": "REPORT",
      "url": "https://launchpad.net/bugs/2154576"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "python-pip regression",
  "upstream": []
}



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