DEBIAN-CVE-2026-39977
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.
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/versions1.4.5-1Source reference:
/affected/0/versions1.4.6-1Source reference:
/affected/0/versions1.4.6-2Source reference:
/affected/0/versions1.4.7-1Source 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
- Added to Heist Feed
- Publisher date