CVE-2026-86320

Flatpak-builder: host code execution via `git am` hook execution in patch source extraction (`use-git-am`)

CVSS 3.1 7.8 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 31 Oct 2026 01:45:32 UTC. Read the latest advisory.

cve-program · CVE-2026-86320

Published

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.

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Affected versions, risk and source history

Advisory history

3 saved versions

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31 Oct 2026 01:45:32 UTC