UBUNTU-CVE-2026-89091 (CVE-2026-89091)

Vulnerability from osv_ubuntu – Published: 2026-10-08 22:17 – Updated: 2026-10-17 09:54 – Source website
VLAI
Details

A flaw was found in ansible-core. When installing a collection with ansible-galaxy collection install, the archive extractor validates member paths using lexical path normalisation (os.path.abspath) instead of resolving symbolic links (os.path.realpath), and it performs no containment check on symlink-typed directory members before creating them. A crafted collection tarball can chain symlink directory entries so that a subsequent file member is written outside the intended destination directory. This allows an attacker who can get a victim to install a malicious collection to overwrite arbitrary files with the privileges of the user running ansible-galaxy, leading to code execution on the control node. This is a bypass of the fix for CVE-2020-10691.

Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible",
            "binary_version": "1.5.4+dfsg-1ubuntu0.1~esm3"
          },
          {
            "binary_name": "ansible-fireball",
            "binary_version": "1.5.4+dfsg-1ubuntu0.1~esm3"
          },
          {
            "binary_name": "ansible-node-fireball",
            "binary_version": "1.5.4+dfsg-1ubuntu0.1~esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "ansible",
        "purl": "pkg:deb/ubuntu/ansible@1.5.4+dfsg-1ubuntu0.1~esm3?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1+dfsg-1",
        "1.3.4+dfsg-1",
        "1.4.0+dfsg-1",
        "1.4.1+dfsg-1",
        "1.4.3+dfsg-1",
        "1.4.4+dfsg-1",
        "1.5.4+dfsg-1",
        "1.5.4+dfsg-1ubuntu0.1~esm1",
        "1.5.4+dfsg-1ubuntu0.1~esm2",
        "1.5.4+dfsg-1ubuntu0.1~esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible",
            "binary_version": "2.0.0.2-2ubuntu1.3+esm6"
          },
          {
            "binary_name": "ansible-fireball",
            "binary_version": "2.0.0.2-2ubuntu1.3+esm6"
          },
          {
            "binary_name": "ansible-node-fireball",
            "binary_version": "2.0.0.2-2ubuntu1.3+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "ansible",
        "purl": "pkg:deb/ubuntu/ansible@2.0.0.2-2ubuntu1.3+esm6?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.2+dfsg-2",
        "1.9.4-1",
        "2.0.0.2-2",
        "2.0.0.2-2ubuntu1",
        "2.0.0.2-2ubuntu1.1",
        "2.0.0.2-2ubuntu1.2",
        "2.0.0.2-2ubuntu1.3",
        "2.0.0.2-2ubuntu1.3+esm1",
        "2.0.0.2-2ubuntu1.3+esm2",
        "2.0.0.2-2ubuntu1.3+esm3",
        "2.0.0.2-2ubuntu1.3+esm4",
        "2.0.0.2-2ubuntu1.3+esm5",
        "2.0.0.2-2ubuntu1.3+esm6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible",
            "binary_version": "2.5.1+dfsg-1ubuntu0.1+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "ansible",
        "purl": "pkg:deb/ubuntu/ansible@2.5.1+dfsg-1ubuntu0.1+esm5?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.1.0+dfsg-2",
        "2.5.0+dfsg-1",
        "2.5.1+dfsg-1",
        "2.5.1+dfsg-1ubuntu0.1",
        "2.5.1+dfsg-1ubuntu0.1+esm1",
        "2.5.1+dfsg-1ubuntu0.1+esm2",
        "2.5.1+dfsg-1ubuntu0.1+esm3",
        "2.5.1+dfsg-1ubuntu0.1+esm4",
        "2.5.1+dfsg-1ubuntu0.1+esm5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible",
            "binary_version": "2.9.6+dfsg-1ubuntu0.1~esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "ansible",
        "purl": "pkg:deb/ubuntu/ansible@2.9.6+dfsg-1ubuntu0.1~esm3?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.8.3+dfsg-1",
        "2.8.6+dfsg-1",
        "2.9.2+dfsg-1",
        "2.9.4+dfsg-1",
        "2.9.6+dfsg-1",
        "2.9.6+dfsg-1ubuntu0.1~esm1",
        "2.9.6+dfsg-1ubuntu0.1~esm2",
        "2.9.6+dfsg-1ubuntu0.1~esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible-core",
            "binary_version": "2.12.0-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ansible-core",
        "purl": "pkg:deb/ubuntu/ansible-core@2.12.0-1ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.12.0-1",
        "2.12.0-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible",
            "binary_version": "2.10.7+merged+base+2.10.8+dfsg-1ubuntu0.1~esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "ansible",
        "purl": "pkg:deb/ubuntu/ansible@2.10.7+merged+base+2.10.8+dfsg-1ubuntu0.1~esm4?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.10.7+merged+base+2.10.8+dfsg-1",
        "2.10.7+merged+base+2.10.8+dfsg-1ubuntu0.1~esm1",
        "2.10.7+merged+base+2.10.8+dfsg-1ubuntu0.1~esm4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible",
            "binary_version": "9.2.0+dfsg-0ubuntu5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ansible",
        "purl": "pkg:deb/ubuntu/ansible@9.2.0+dfsg-0ubuntu5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.7.0+dfsg-1",
        "7.7.0+dfsg-3",
        "9.2.0+dfsg-0ubuntu4",
        "9.2.0+dfsg-0ubuntu5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible-core",
            "binary_version": "2.16.3-0ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ansible-core",
        "purl": "pkg:deb/ubuntu/ansible-core@2.16.3-0ubuntu2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.14.9-2",
        "2.14.11-1",
        "2.14.11-2",
        "2.14.13-1",
        "2.16.3-0ubuntu1",
        "2.16.3-0ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible",
            "binary_version": "13.4.0+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "ansible",
        "purl": "pkg:deb/ubuntu/ansible@13.4.0+dfsg-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "13.1.0+dfsg-1ubuntu1",
        "13.4.0+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible-core",
            "binary_version": "2.22.0~beta2-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "ansible-core",
        "purl": "pkg:deb/ubuntu/ansible-core@2.22.0~beta2-1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.20.1-1",
        "2.21.1~rc1-1",
        "2.21.1~rc1-2",
        "2.21.1~rc1-2ubuntu1",
        "2.22.0~beta2-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible",
            "binary_version": "13.1.0+dfsg-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ansible",
        "purl": "pkg:deb/ubuntu/ansible@13.1.0+dfsg-1ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "12.0.0~b1+dfsg-1",
        "12.0.0+dfsg-1",
        "12.2.0+dfsg-1",
        "13.1.0+dfsg-1",
        "13.1.0+dfsg-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ansible-core",
            "binary_version": "2.20.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ansible-core",
        "purl": "pkg:deb/ubuntu/ansible-core@2.20.1-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.19.0-1ubuntu1",
        "2.19.4-1",
        "2.20.1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in ansible-core. When installing a collection with `ansible-galaxy collection install`, the archive extractor validates member paths using lexical path normalisation (os.path.abspath) instead of resolving symbolic links (os.path.realpath), and it performs no containment check on symlink-typed directory members before creating them. A crafted collection tarball can chain symlink directory entries so that a subsequent file member is written outside the intended destination directory. This allows an attacker who can get a victim to install a malicious collection to overwrite arbitrary files with the privileges of the user running ansible-galaxy, leading to code execution on the control node. This is a bypass of the fix for CVE-2020-10691.",
  "id": "UBUNTU-CVE-2026-89091",
  "modified": "2026-10-17T09:54:16Z",
  "published": "2026-10-08T22:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-89091"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89091"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-89091"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531646"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-89091"
  ]
}



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