Unrated

UBUNTU-CVE-2026-96275

Type: advisorySource: OSV1 source record

A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem via extract_extra_data(). On system installs, the write happens as root. Two issues combine: `files/extra` is resolved via path operations that follow symlinks, and blob names from `xa.extra-data-sources` are not sanitized against `..` traversal.

Announced 23 Sept 2026Source revision 1

Original source ↗

UBUNTU-CVE-2026-96275

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:UBUNTU-CVE-2026-96275

flatpak

Source reference: /affected/0/package/name

Affected versions: 0.8.7-5
Source reference: /affected/0/versions
0.10.0-1
Source reference: /affected/0/versions
0.10.0-2
Source reference: /affected/0/versions
0.10.1-1
Source reference: /affected/0/versions
0.10.2-1
Source reference: /affected/0/versions
0.10.2.1-1
Source reference: /affected/0/versions
0.10.2.1-2
Source reference: /affected/0/versions
0.10.3-1
Source reference: /affected/0/versions
0.11.1-0ubuntu1
Source reference: /affected/0/versions
0.11.3-2
Source reference: /affected/0/versions
0.11.3-3
Source reference: /affected/0/versions
0.11.7-0ubuntu0.1
Source reference: /affected/0/versions
1.0.1-0ubuntu0.1
Source reference: /affected/0/versions
1.0.6-0ubuntu0.1
Source reference: /affected/0/versions
1.0.7-0ubuntu0.18.04.1
Source reference: /affected/0/versions
1.0.8-0ubuntu0.18.04.1
Source reference: /affected/0/versions
1.0.9-0ubuntu0.1
Source reference: /affected/0/versions
1.0.9-0ubuntu0.2
Source reference: /affected/0/versions
1.0.9-0ubuntu0.3
Source reference: /affected/0/versions
1.0.9-0ubuntu0.4
Source reference: /affected/0/versions
1.0.9-0ubuntu0.4+esm1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

flatpak

Source reference: /affected/1/package/name

Affected versions: 1.4.3-1
Source reference: /affected/1/versions
1.6.0-1
Source reference: /affected/1/versions
1.6.1-1
Source reference: /affected/1/versions
1.6.2-1
Source reference: /affected/1/versions
1.6.3-1
Source reference: /affected/1/versions
1.6.5-0ubuntu0.1
Source reference: /affected/1/versions
1.6.5-0ubuntu0.2
Source reference: /affected/1/versions
1.6.5-0ubuntu0.3
Source reference: /affected/1/versions
1.6.5-0ubuntu0.4
Source reference: /affected/1/versions
1.6.5-0ubuntu0.5
Source reference: /affected/1/versions
1.6.5-0ubuntu0.5+esm1
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

flatpak

Source reference: /affected/2/package/name

Affected versions: 1.10.2-3
Source reference: /affected/2/versions
1.12.2-1
Source reference: /affected/2/versions
1.12.2-2
Source reference: /affected/2/versions
1.12.3-1
Source reference: /affected/2/versions
1.12.4-1
Source reference: /affected/2/versions
1.12.5-1
Source reference: /affected/2/versions
1.12.6-1
Source reference: /affected/2/versions
1.12.7-1
Source reference: /affected/2/versions
1.12.7-1ubuntu0.1
Source reference: /affected/2/versions
1.12.7-1ubuntu0.1+esm1
Source reference: /affected/2/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

flatpak

Source reference: /affected/3/package/name

Affected versions: 1.14.4-2
Source reference: /affected/3/versions
1.14.5-1
Source reference: /affected/3/versions
1.14.5-1build1
Source reference: /affected/3/versions
1.14.5-1build4
Source reference: /affected/3/versions
1.14.5-1build5
Source reference: /affected/3/versions
1.14.5-1build6
Source reference: /affected/3/versions
1.14.6-1
Source reference: /affected/3/versions
1.14.6-1ubuntu0.1
Source reference: /affected/3/versions
1.14.6-1ubuntu0.1+esm1
Source reference: /affected/3/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

flatpak

Source reference: /affected/4/package/name

Affected versions: 1.16.1-2ubuntu1
Source reference: /affected/4/versions
1.16.1-3ubuntu1
Source reference: /affected/4/versions
1.16.2-1
Source reference: /affected/4/versions
1.16.3-1
Source reference: /affected/4/versions
1.16.3-1build1
Source reference: /affected/4/versions
1.16.4-1
Source reference: /affected/4/versions
1.16.4-2
Source reference: /affected/4/versions
1.16.6-1
Source reference: /affected/4/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "flatpak",
      "purl": "pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Fbionic",
      "ecosystem": "Ubuntu:Pro:18.04:LTS"
    },
    "versions": [
      "0.8.7-5",
      "0.10.0-1",
      "0.10.0-2",
      "0.10.1-1",
      "0.10.2-1",
      "0.10.2.1-1",
      "0.10.2.1-2",
      "0.10.3-1",
      "0.11.1-0ubuntu1",
      "0.11.3-2",
      "0.11.3-3",
      "0.11.7-0ubuntu0.1",
      "1.0.1-0ubuntu0.1",
      "1.0.6-0ubuntu0.1",
      "1.0.7-0ubuntu0.18.04.1",
      "1.0.8-0ubuntu0.18.04.1",
      "1.0.9-0ubuntu0.1",
      "1.0.9-0ubuntu0.2",
      "1.0.9-0ubuntu0.3",
      "1.0.9-0ubuntu0.4",
      "1.0.9-0ubuntu0.4+esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96275.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "flatpak",
          "binary_version": "1.0.9-0ubuntu0.4+esm1"
        },
        {
          "binary_name": "flatpak-tests",
          "binary_version": "1.0.9-0ubuntu0.4+esm1"
        },
        {
          "binary_name": "gir1.2-flatpak-1.0",
          "binary_version": "1.0.9-0ubuntu0.4+esm1"
        },
        {
          "binary_name": "libflatpak0",
          "binary_version": "1.0.9-0ubuntu0.4+esm1"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "flatpak",
      "purl": "pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Ffocal",
      "ecosystem": "Ubuntu:Pro:20.04:LTS"
    },
    "versions": [
      "1.4.3-1",
      "1.6.0-1",
      "1.6.1-1",
      "1.6.2-1",
      "1.6.3-1",
      "1.6.5-0ubuntu0.1",
      "1.6.5-0ubuntu0.2",
      "1.6.5-0ubuntu0.3",
      "1.6.5-0ubuntu0.4",
      "1.6.5-0ubuntu0.5",
      "1.6.5-0ubuntu0.5+esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96275.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "flatpak",
          "binary_version": "1.6.5-0ubuntu0.5+esm1"
        },
        {
          "binary_name": "flatpak-tests",
          "binary_version": "1.6.5-0ubuntu0.5+esm1"
        },
        {
          "binary_name": "gir1.2-flatpak-1.0",
          "binary_version": "1.6.5-0ubuntu0.5+esm1"
        },
        {
          "binary_name": "libflatpak0",
          "binary_version": "1.6.5-0ubuntu0.5+esm1"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "flatpak",
      "purl": "pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Fjammy",
      "ecosystem": "Ubuntu:Pro:22.04:LTS"
    },
    "versions": [
      "1.10.2-3",
      "1.12.2-1",
      "1.12.2-2",
      "1.12.3-1",
      "1.12.4-1",
      "1.12.5-1",
      "1.12.6-1",
      "1.12.7-1",
      "1.12.7-1ubuntu0.1",
      "1.12.7-1ubuntu0.1+esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96275.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "flatpak",
          "binary_version": "1.12.7-1ubuntu0.1+esm1"
        },
        {
          "binary_name": "flatpak-tests",
          "binary_version": "1.12.7-1ubuntu0.1+esm1"
        },
        {
          "binary_name": "gir1.2-flatpak-1.0",
          "binary_version": "1.12.7-1ubuntu0.1+esm1"
        },
        {
          "binary_name": "libflatpak0",
          "binary_version": "1.12.7-1ubuntu0.1+esm1"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "flatpak",
      "purl": "pkg:deb/ubuntu/flatpak?arch=source&distro=esm-apps%2Fnoble",
      "ecosystem": "Ubuntu:Pro:24.04:LTS"
    },
    "versions": [
      "1.14.4-2",
      "1.14.5-1",
      "1.14.5-1build1",
      "1.14.5-1build4",
      "1.14.5-1build5",
      "1.14.5-1build6",
      "1.14.6-1",
      "1.14.6-1ubuntu0.1",
      "1.14.6-1ubuntu0.1+esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96275.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "flatpak",
          "binary_version": "1.14.6-1ubuntu0.1+esm1"
        },
        {
          "binary_name": "flatpak-tests",
          "binary_version": "1.14.6-1ubuntu0.1+esm1"
        },
        {
          "binary_name": "gir1.2-flatpak-1.0",
          "binary_version": "1.14.6-1ubuntu0.1+esm1"
        },
        {
          "binary_name": "libflatpak0",
          "binary_version": "1.14.6-1ubuntu0.1+esm1"
        }
      ]
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "flatpak",
      "purl": "pkg:deb/ubuntu/flatpak?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "1.16.1-2ubuntu1",
      "1.16.1-3ubuntu1",
      "1.16.2-1",
      "1.16.3-1",
      "1.16.3-1build1",
      "1.16.4-1",
      "1.16.4-2",
      "1.16.6-1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-96275.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "flatpak",
          "binary_version": "1.16.6-1"
        },
        {
          "binary_name": "flatpak-tests",
          "binary_version": "1.16.6-1"
        },
        {
          "binary_name": "gir1.2-flatpak-1.0",
          "binary_version": "1.16.6-1"
        },
        {
          "binary_name": "libflatpak0",
          "binary_version": "1.16.6-1"
        }
      ]
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #51968 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 14:36:49 GMT
Publisher date: Wed, 23 Sep 2026 15:17:00 GMT

Read the original announcement