CVE-2026-86320

Name	CVE-2026-86320
Description	A flaw was found in flatpak-builder where Git hooks are not disabled when applying patch sources with use-git-am: true. An attacker who can provide a malicious source containing a Git post-applypatch hook can cause the hook to execute on the host during the build process, resulting in arbitrary code execution with the privileges of the user running flatpak-builder.
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	1147700

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			1147700

Notes

[trixie] - flatpak-builder <no-dsa> (Minor issue)
[bookworm] - flatpak-builder <postponed> (Minor issue)
https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv