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DEBIAN-CVE-2026-39977

Type: advisorySource: OSV1 source record

flatpak-builder is a tool to build flatpaks from source. From 1.4.5 to before 1.4.8, the license-files manifest key takes an array of paths to user defined licence files relative to the source directory of the module. The paths from that array are resolved using g_file_resolve_relative_path() and validated to stay inside the source directory using two checks - g_file_get_relative_path() which does not resolve symlinks and g_file_query_file_type() with G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS which only applies to the final path component. The copy operation runs on host. This can be exploited by using a crafted manifest and/or source to read arbitrary files from the host and capture them into the build output. This vulnerability is fixed in 1.4.8.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-39977

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:DEBIAN-CVE-2026-39977

flatpak-builder

Source reference: /affected/0/package/name

Affected versions
1.4.4-2

Source reference: /affected/0/versions

1.4.5-1

Source reference: /affected/0/versions

1.4.6-1

Source reference: /affected/0/versions

1.4.6-2

Source reference: /affected/0/versions

1.4.7-1

Source reference: /affected/0/versions

Fixed versions
1.4.8-1

Source reference: /affected/0/ranges

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"
          },
          {
            "fixed": "1.4.8-1"
          }
        ]
      }
    ],
    "package": {
      "name": "flatpak-builder",
      "purl": "pkg:deb/debian/flatpak-builder?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.4.4-2",
      "1.4.5-1",
      "1.4.6-1",
      "1.4.6-2",
      "1.4.7-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-39977.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56450 · Revision 1
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Publisher date
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