Arbitrary Code Injection Affecting flatpak-builder package, versions <0:1.2.3-1.el9_6.1


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.24% (15th percentile)

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  • Snyk IDSNYK-RHEL9-FLATPAKBUILDER-21280334
  • published20 Oct 2026
  • disclosed13 Aug 2026

Introduced: 13 Aug 2026

CVE-2026-86320  (opens in a new tab)
CWE-94  (opens in a new tab)

How to fix?

Upgrade RHEL:9 flatpak-builder to version 0:1.2.3-1.el9_6.1 or higher.
This issue was patched in RHSA-2026:84833.

NVD Description

Note: Versions mentioned in the description apply only to the upstream flatpak-builder package and not the flatpak-builder package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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 Base Scores

version 3.1