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.
https://access.redhat.com/errata/RHSA-2026:90896
https://access.redhat.com/errata/RHSA-2026:86714
https://access.redhat.com/errata/RHSA-2026:84842
https://access.redhat.com/errata/RHSA-2026:84834
https://access.redhat.com/errata/RHSA-2026:84833
https://access.redhat.com/errata/RHSA-2026:84832
https://access.redhat.com/errata/RHSA-2026:80973