CVE-2026-107466

Name	CVE-2026-107466
Description	A flaw was found in flatpak-builder. This vulnerability allows an attacker to cause information disclosure by convincing a user or continuous integration (CI) system to process a crafted build manifest. By specifying local file Uniform Resource Identifiers (URIs) within source download definitions, the builder bypasses directory confinement checks. As a result, sensitive host files accessible to the build process can be read and incorporated into the build artifacts.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1147701

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
flatpak-builder (PTS)	bookworm	1.2.3-1	vulnerable
	trixie	1.4.4-2	vulnerable
	forky, sid	1.4.12-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
flatpak-builder	source	(unstable)	1.4.11-1			1147701

Notes

[trixie] - flatpak-builder <no-dsa> (Minor issue)
[bookworm] - flatpak-builder <postponed> (Minor issue)
https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-484h-v688-jq5j