# CVE-2026-86320: flatpak-builder: A flaw was found in flatpak-builder where Git hooks are not disabled when applying patch sources with use-git-am: true

CVE-2026-86320 is fixed in 4 products on 1 platform, first by RHSA-2026:84834, released August 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-86320
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0030
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 13, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | flatpak-builder Debian 14 | 1.4.11-1 | [DEBIAN-CVE-2026-86320](https://patchblox.com/security/data/fix/linux/debian-cve-2026-86320.md) | Sep 17, 2026 |
| Linux | flatpak-builder RHEL 10 | 1.4.4-1.el10_0.1 | [RHSA-2026:84834](https://patchblox.com/security/data/fix/linux/rhsa-2026-84834.md) | Aug 13, 2026 |
| Linux | flatpak-builder RHEL 8 | 0:1.2.3-2.el8_10 | [RHSA-2026:80973](https://patchblox.com/security/data/fix/linux/rhsa-2026-80973.md) | Oct 13, 2026 |
| Linux | flatpak-builder RHEL 9 | 0:1.2.3-1.el9_8.1 | [RHSA-2026:80496](https://patchblox.com/security/data/fix/linux/rhsa-2026-80496.md) | Oct 12, 2026 |
| Linux | flatpak-builder almalinux 10 | 1.4.4-1.el10_2.1 | [ALSA-2026:80495](https://patchblox.com/security/data/fix/linux/alsa-2026-80495.md) | Nov 7, 2026 |
| Linux | flatpak-builder almalinux 8 | 1.2.3-2.el8_10 | [ALSA-2026:80973](https://patchblox.com/security/data/fix/linux/alsa-2026-80973.md) | Nov 7, 2026 |
| Linux | flatpak-builder almalinux 9 | 1.2.3-1.el9_8.1 | [ALSA-2026:80496](https://patchblox.com/security/data/fix/linux/alsa-2026-80496.md) | Nov 7, 2026 |
| Linux | flatpak-builder amzn 2023 | 1.4.4-1.amzn2023.0.2 | [ALAS2023-2026-3152](https://patchblox.com/security/data/fix/linux/alas2023-2026-3152.md) | Nov 7, 2026 |
| Linux | flatpak-builder ol 10 | 0:1.4.4-1.el10_2.1 | [ELSA-2026-80495](https://patchblox.com/security/data/fix/linux/elsa-2026-80495.md) | Nov 7, 2026 |
| Linux | flatpak-builder ol 8 | 0:1.2.3-2.el8_10 | [ELSA-2026-80973](https://patchblox.com/security/data/fix/linux/elsa-2026-80973.md) | Nov 7, 2026 |
| Linux | flatpak-builder ol 9 | 0:1.2.3-1.el9_8.1 | [ELSA-2026-80496](https://patchblox.com/security/data/fix/linux/elsa-2026-80496.md) | Nov 7, 2026 |
| Linux | flatpak-builder rocky 10 | 0:1.4.4-1.el10_2.1 | [RLSA-2026:80495](https://patchblox.com/security/data/fix/linux/rlsa-2026-80495.md) | Nov 7, 2026 |
| Linux | flatpak-builder rocky 8 | 0:1.2.3-2.el8_10 | [RLSA-2026:80973](https://patchblox.com/security/data/fix/linux/rlsa-2026-80973.md) | Nov 7, 2026 |
| Linux | flatpak-builder rocky 9 | 0:1.2.3-1.el9_8.1 | [RLSA-2026:80496](https://patchblox.com/security/data/fix/linux/rlsa-2026-80496.md) | Nov 7, 2026 |
| Linux | flatpak-builder-debuginfo amzn 2023 | 1.4.4-1.amzn2023.0.2 | [ALAS2023-2026-3152](https://patchblox.com/security/data/fix/linux/alas2023-2026-3152.md) | Nov 7, 2026 |
| Linux | flatpak-builder-debugsource amzn 2023 | 1.4.4-1.amzn2023.0.2 | [ALAS2023-2026-3152](https://patchblox.com/security/data/fix/linux/alas2023-2026-3152.md) | Nov 7, 2026 |
| Linux | flatpak-builder-tests amzn 2023 | 1.4.4-1.amzn2023.0.2 | [ALAS2023-2026-3152](https://patchblox.com/security/data/fix/linux/alas2023-2026-3152.md) | Nov 7, 2026 |

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Data as of 2026-11-12T01:51:14Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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