🛡️ CVE-2026-39977
🟡 CVSS 6.3 — Medium ⚠️ Exploit Public CWE-22 NVD
6.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity MEDIUM
CVSS Score 6.3
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
CWE CWE-22
Public Exploit ⚠️ Yes
Source NVD
Published 2026-04-09
Updated 2026-06-02
Modified 2026-04-16
Fix URL N/A

Affected Packages

Software From version Fixed in
flatpak-builder 1.4.5 1.4.8

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