UBUNTU-CVE-2026-25636 (CVE-2026-25636)

Vulnerability from osv_ubuntu – Published: 2026-02-06 21:16 – Updated: 2026-05-20 15:26 – Source website
VLAI
Details

calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre's EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.

Severity
8.2 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/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": "calibre",
            "binary_version": "2.55.0+dfsg-1ubuntu0.2"
          },
          {
            "binary_name": "calibre-bin",
            "binary_version": "2.55.0+dfsg-1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "calibre",
        "purl": "pkg:deb/ubuntu/calibre@2.55.0+dfsg-1ubuntu0.2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.33.0+dfsg-1build1",
        "2.38.0+dfsg-1",
        "2.45.0+dfsg-1",
        "2.45.0+dfsg-1build1",
        "2.48.0+dfsg-1",
        "2.48.0+dfsg-1build1",
        "2.54.0+dfsg-1",
        "2.55.0+dfsg-1",
        "2.55.0+dfsg-1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "calibre",
            "binary_version": "3.21.0+dfsg-1build1"
          },
          {
            "binary_name": "calibre-bin",
            "binary_version": "3.21.0+dfsg-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "calibre",
        "purl": "pkg:deb/ubuntu/calibre@3.21.0+dfsg-1build1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.7.0+dfsg-2",
        "3.7.0+dfsg-2build1",
        "3.12.0+dfsg-1",
        "3.13.0+dfsg-1",
        "3.14.0+dfsg-1",
        "3.15.0.1+dfsg-1",
        "3.16.0+dfsg-1",
        "3.16.0+dfsg-1build1",
        "3.17.0+dfsg-1",
        "3.17.0+dfsg-2",
        "3.18.0+dfsg-1build1",
        "3.19.0+dfsg-1",
        "3.20.0+dfsg-1",
        "3.21.0+dfsg-1",
        "3.21.0+dfsg-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "calibre",
            "binary_version": "4.99.4+dfsg+really4.12.0-1ubuntu1"
          },
          {
            "binary_name": "calibre-bin",
            "binary_version": "4.99.4+dfsg+really4.12.0-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "calibre",
        "purl": "pkg:deb/ubuntu/calibre@4.99.4+dfsg+really4.12.0-1ubuntu1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.46.0+dfsg-1",
        "4.2.0+dfsg-2",
        "4.3.0+dfsg-1",
        "4.3.0+dfsg-2",
        "4.4.0+dfsg-1",
        "4.5.0+dfsg-1",
        "4.5.0+dfsg-2",
        "4.5.0+dfsg-3",
        "4.6.0+dfsg-1",
        "4.7.0+dfsg-1",
        "4.99.3+dfsg-2",
        "4.99.4+dfsg-1",
        "4.99.4+dfsg-1build1",
        "4.99.4+dfsg+really4.10.0+py3-2",
        "4.99.4+dfsg+really4.11.2-1",
        "4.99.4+dfsg+really4.11.2-1build1",
        "4.99.4+dfsg+really4.12.0-1",
        "4.99.4+dfsg+really4.12.0-1build1",
        "4.99.4+dfsg+really4.12.0-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "calibre",
            "binary_version": "5.37.0+dfsg-1build1"
          },
          {
            "binary_name": "calibre-bin",
            "binary_version": "5.37.0+dfsg-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "calibre",
        "purl": "pkg:deb/ubuntu/calibre@5.37.0+dfsg-1build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.25.0+dfsg-2",
        "5.33.2+dfsg-1",
        "5.34.0+dfsg-1",
        "5.35.0+dfsg-1ubuntu2",
        "5.37.0+dfsg-1",
        "5.37.0+dfsg-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "calibre",
            "binary_version": "7.6.0+ds-1build1"
          },
          {
            "binary_name": "calibre-bin",
            "binary_version": "7.6.0+ds-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "calibre",
        "purl": "pkg:deb/ubuntu/calibre@7.6.0+ds-1build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.24.0+ds-1",
        "6.29.0+ds-1",
        "7.0.0+ds-1",
        "7.1.0+ds-1",
        "7.1.0+ds-2",
        "7.2.0+ds-1",
        "7.2.0+ds-1build1",
        "7.3.0+ds-1",
        "7.4.0+ds-1",
        "7.5.1+ds-1",
        "7.5.1+ds-2",
        "7.5.1+ds-3",
        "7.6.0+ds-1",
        "7.6.0+ds-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "calibre",
            "binary_version": "8.8.0+ds-3build1"
          },
          {
            "binary_name": "calibre-bin",
            "binary_version": "8.8.0+ds-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "calibre",
        "purl": "pkg:deb/ubuntu/calibre@8.8.0+ds-3build1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.26.0+ds-4build1",
        "8.3.0+ds-1",
        "8.4.0+ds-1",
        "8.5.0+ds-1",
        "8.6.0+ds-1",
        "8.7.0+ds-1",
        "8.8.0+ds-2",
        "8.8.0+ds-3",
        "8.8.0+ds-3build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "calibre",
            "binary_version": "9.2.1+ds+~0.10.5-2build1"
          },
          {
            "binary_name": "calibre-bin",
            "binary_version": "9.2.1+ds+~0.10.5-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "calibre",
        "purl": "pkg:deb/ubuntu/calibre@9.2.1+ds+~0.10.5-2build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.8.0+ds-3build1",
        "8.13.0+ds+~0.10.5-3",
        "8.14.0+ds+~0.10.5-1",
        "8.15.0+ds+~0.10.5-1",
        "8.16.0+ds+~0.10.5-2",
        "8.16.2+ds+~0.10.5-1",
        "8.16.2+ds+~0.10.5-2",
        "8.16.2+ds+~0.10.5-3",
        "9.2.1+ds+~0.10.5-2build1"
      ]
    }
  ],
  "aliases": [],
  "details": "calibre is an e-book manager. In 9.1.0 and earlier, a path traversal vulnerability in Calibre\u0027s EPUB conversion allows a malicious EPUB file to corrupt arbitrary existing files writable by the Calibre process. During conversion, Calibre resolves CipherReference URI from META-INF/encryption.xml to an absolute filesystem path and opens it in read-write mode, even when it points outside the conversion extraction directory. This vulnerability is fixed in 9.2.0.",
  "id": "UBUNTU-CVE-2026-25636",
  "modified": "2026-05-20T15:26:05Z",
  "published": "2026-02-06T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-25636"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-25636"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/kovidgoyal/calibre/commit/9484ea82c6ab226c18e6ca5aa000fa16de598726"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/kovidgoyal/calibre/security/advisories/GHSA-8r26-m7j5-hm29"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-25636"
  ]
}



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