CVE-2026-39977— flatpak-builder has a path traversal leading to arbitrary file read on host when installing licence files
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-39977
Vulnerability Information
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Vulnerability Title
flatpak-builder has a path traversal leading to arbitrary file read on host when installing licence files
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
flatpak-builder 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
flatpak-builder是Flatpak开源的一个Flatpak应用构建工具。 flatpak-builder 1.4.5至1.4.8之前版本存在路径遍历漏洞，该漏洞源于license-files清单键的路径解析和验证不足，可能导致从主机读取任意文件并捕获到构建输出中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| flatpak | flatpak-builder | >= 1.4.5, < 1.4.8 | - |
II. Public POCs for CVE-2026-39977
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-39977 (1)
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V. Comments for CVE-2026-39977
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