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.

CVSS Vector

References

• https://access.redhat.com/security/cve/CVE-2026-86320
• https://bugzilla.redhat.com/show_bug.cgi?id=2471023
• https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv
• https://bugzilla.redhat.com/show_bug.cgi?id=2471023
• https://github.com/flatpak/flatpak-builder/security/advisories/GHSA-j5p8-jgjc-f3xv