CVE-2026-86320 Flatpak-builder: host code execution via `git am` hook execution in patch source extraction (`use-git-am`)
Attackers can execute arbitrary code on the host by providing malicious Git hooks in patch sources when use-git-am is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-86320?
CVE-2026-86320 is a high-severity code injection vulnerability in Red Hat Enterprise Linux 10, published on 17 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2026-86320?
Linux distribution packages (28)
flatpak-builder AlmaLinux:10 | All versions | 1.4.4-1.el10_2.1 |
flatpak-builder AlmaLinux:8 | All versions | 1.2.3-2.el8_10 |
flatpak-builder AlmaLinux:9 | All versions | 1.2.3-1.el9_8.1 |
flatpak-builder Red Hat:enterprise_linux:10.2 | All versions | 0:1.4.4-1.el10_2.1 |
flatpak-builder-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:1.4.4-1.el10_2.1 |
flatpak-builder-debugsource Red Hat:enterprise_linux:10.2 | All versions | 0:1.4.4-1.el10_2.1 |
flatpak-builder Red Hat:enterprise_linux:8::appstream | All versions | 0:1.2.3-2.el8_10 |
flatpak-builder-debuginfo Red Hat:enterprise_linux:8::appstream | All versions | 0:1.2.3-2.el8_10 |
flatpak-builder-debugsource Red Hat:enterprise_linux:8::appstream | All versions | 0:1.2.3-2.el8_10 |
flatpak-builder Red Hat:enterprise_linux:9::appstream | All versions | 0:1.2.3-1.el9_8.1 |
flatpak-builder-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 0:1.2.3-1.el9_8.1 |
flatpak-builder-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 0:1.2.3-1.el9_8.1 |
flatpak-builder Red Hat:enterprise_linux_eus:10.0 | All versions | 0:1.4.4-1.el10_0.1 |
flatpak-builder-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:1.4.4-1.el10_0.1 |
flatpak-builder-debugsource Red Hat:enterprise_linux_eus:10.0 | All versions | 0:1.4.4-1.el10_0.1 |
flatpak-builder Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.2.2-2.el9_2 |
flatpak-builder-debuginfo Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.2.2-2.el9_2 |
flatpak-builder-debugsource Red Hat:rhel_e4s:9.2::appstream | All versions | 0:1.2.2-2.el9_2 |
flatpak-builder Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.2.3-2.el9_4 |
flatpak-builder-debuginfo Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.2.3-2.el9_4 |
flatpak-builder-debugsource Red Hat:rhel_e4s:9.4::appstream | All versions | 0:1.2.3-2.el9_4 |
flatpak-builder Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.2.3-1.el9_6.1 |
flatpak-builder-debuginfo Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.2.3-1.el9_6.1 |
flatpak-builder-debugsource Red Hat:rhel_eus:9.6::appstream | All versions | 0:1.2.3-1.el9_6.1 |
flatpak-builder Rocky Linux:10 | All versions | 0:1.4.4-1.el10_2.1 |
flatpak-builder Rocky Linux:8 | All versions | 0:1.2.3-2.el8_10 |
flatpak-builder Rocky Linux:9 | All versions | 0:1.2.3-1.el9_8.1 |
flatpak-builder openSUSE:Tumbleweed | All versions | 1.4.12-1.1 |
How do I fix CVE-2026-86320?
Apply the vendor's patch.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-86320 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86320 exists.
Sources
Also known as ALSA-2026:80495, ALSA-2026:80496, ALSA-2026:80973, CLSA-2026-1792771054, DEBIAN-CVE-2026-86320, GHSA-rvpr-5p35-6vf8 and 17 more.