Arbitrary Code Injection Affecting flatpak-builder package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.29% (22nd percentile)

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  • Snyk IDSNYK-DEBIAN13-FLATPAKBUILDER-19786897
  • published15 Sept 2026
  • disclosed17 Sept 2026

Introduced: 15 Sep 2026

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

How to fix?

There is no fixed version for Debian:13 flatpak-builder.

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 Debian. See How to fix? for Debian:13 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