ubuntu-cve-2026-44307
Vulnerability from osv_ubuntu
Published
2026-05-12 22:16
Modified
2026-05-20 21:47
Summary
Details

Mako is a template library written in Python. Prior to 1.3.12, on Windows, a URI using backslash traversal (e.g. ....\ secret.txt) bypasses the directory traversal check in Template.init and the posixpath-based normalization in TemplateLookup.get_template(), allowing reads of files outside the configured template directory. This vulnerability is fixed in 1.3.12.

Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-mako",
            "binary_version": "1.0.3+ds1-1ubuntu1+esm2"
          },
          {
            "binary_name": "python3-mako",
            "binary_version": "1.0.3+ds1-1ubuntu1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "mako",
        "purl": "pkg:deb/ubuntu/mako@1.0.3+ds1-1ubuntu1+esm2?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.2+ds1-1",
        "1.0.3+ds1-1",
        "1.0.3+ds1-1ubuntu1",
        "1.0.3+ds1-1ubuntu1+esm1",
        "1.0.3+ds1-1ubuntu1+esm2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-mako",
            "binary_version": "1.0.7+ds1-1ubuntu0.2+esm1"
          },
          {
            "binary_name": "python3-mako",
            "binary_version": "1.0.7+ds1-1ubuntu0.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "mako",
        "purl": "pkg:deb/ubuntu/mako@1.0.7+ds1-1ubuntu0.2+esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.7+ds1-1",
        "1.0.7+ds1-1ubuntu0.2",
        "1.0.7+ds1-1ubuntu0.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-mako",
            "binary_version": "1.1.0+ds1-1ubuntu2.1+esm1"
          },
          {
            "binary_name": "python3-mako",
            "binary_version": "1.1.0+ds1-1ubuntu2.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "mako",
        "purl": "pkg:deb/ubuntu/mako@1.1.0+ds1-1ubuntu2.1+esm1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.7+ds1-1",
        "1.1.0+ds1-1",
        "1.1.0+ds1-1ubuntu1",
        "1.1.0+ds1-1ubuntu2",
        "1.1.0+ds1-1ubuntu2.1",
        "1.1.0+ds1-1ubuntu2.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-mako",
            "binary_version": "1.1.3+ds1-2ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "mako",
        "purl": "pkg:deb/ubuntu/mako@1.1.3+ds1-2ubuntu0.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.3+ds1-2",
        "1.1.3+ds1-2ubuntu0.1",
        "1.1.3+ds1-2ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-mako",
            "binary_version": "1.3.2-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "mako",
        "purl": "pkg:deb/ubuntu/mako@1.3.2-1ubuntu0.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.4+ds-2",
        "1.3.1-1",
        "1.3.2-1",
        "1.3.2-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-mako",
            "binary_version": "1.3.9-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "mako",
        "purl": "pkg:deb/ubuntu/mako@1.3.9-1ubuntu0.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.8-2",
        "1.3.9-1",
        "1.3.9-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-mako",
            "binary_version": "1.3.10-3ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "mako",
        "purl": "pkg:deb/ubuntu/mako@1.3.10-3ubuntu0.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.9-1",
        "1.3.10-3",
        "1.3.10-3build1",
        "1.3.10-3ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "Mako is a template library written in Python. Prior to 1.3.12, on Windows, a URI using backslash traversal (e.g. \\..\\..\\ secret.txt) bypasses the directory traversal check in Template.__init__ and the posixpath-based normalization in TemplateLookup.get_template(), allowing reads of files outside the configured template directory. This vulnerability is fixed in 1.3.12.",
  "id": "UBUNTU-CVE-2026-44307",
  "modified": "2026-05-20T21:47:59Z",
  "published": "2026-05-12T22:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44307"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-44307"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sqlalchemy/mako/commit/72e10c573ca0fbcbddd4455abca8ce92a61780d7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sqlalchemy/mako/issues/435"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sqlalchemy/mako/releases/tag/rel_1_3_12"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sqlalchemy/mako/security/advisories/GHSA-2h4p-vjrc-8xpq"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-44307"
  ],
  "withdrawn": "2026-05-23T19:12:25Z"
}



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