CVE-2026-39977: flatpak-builder, обхождане на път

Описание

Оригинално описание

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.

Засегнати продукти

• flatpak flatpak-builder: >= 1.4.5, < 1.4.8

Вид слабост

• CWE-22 Неправилно ограничаване на път до позволена директория

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-39977
• https://nvd.nist.gov/vuln/detail/CVE-2026-39977
• https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-6gm9-3g7m-3965